Sustainable Legacies of a Climate Positive Olympic Games: An Assessment of Carbon Offsets and Renewable Energy for Brisbane 2032

Abstract

Brisbane, Australia will host the Olympic and Paralympic Games in 2032—the first to be contractually obliged to be Climate Positive. This commitment can be achieved through a combination of two levers: emission reduction measures and carbon offsets. The objective of this study is to determine which combination of these levers is likely to maximise sustainability and its social, economic, and ecological dimensions. Based on these dimensions and the perspective of technology determinism, a novel sustainability assessment model is developed. Then, through a document analysis, this study uses emissions data to analyse and evaluate three different combinations of carbon offsets and renewable energy. Results showed that a higher reliance on carbon offsets resulted in poorer sustainability outcomes for this mega-event. The most sustainable scenario, involving large-scale investment in renewable energy infrastructure, involved significant cost implications but is likely to create greater legacy outcomes. Key recommendations include improving the governance and socialisation of Climate Positive delivery, and increasing partnerships with the private sector. Doing so will help enhance the authenticity and legacy of Climate Positive commitments for host regions.

1. Introduction

1.1. Background and Context

The 2032 Olympic and Paralympic Games, to be hosted in Brisbane, Queensland, Australia, are the first to be contractually obliged to be delivered as “Climate Positive”. The Games are also the first to be awarded under the International Olympic Committee (IOC)’s New Norm, adopted as part of Olympic Agenda 2020, which seeks to minimise costs, complexity, risk and waste; and maximise sustainability, flexibility, efficiency and partnerships [1]. Sustainability and climate commitments have been increasing in recent Olympics, with the Tokyo 2020 Games officially achieving carbon neutrality, and subsequent Games all committed to delivering similar commitments [2].

With this increasing focus on carbon emissions, a fundamental design choice in Games delivery is emerging: the extent to which carbon offsets are used. Further, in the case of Brisbane 2032, the contractual delivery of a Climate Positive Games, by its very definition, necessitates carbon offsets to be an unavoidable part of Games planning and hosting. While carbon offsets have some level of appropriateness for discrete, time-bound activities such as major events, an over-reliance on offsets may reduce opportunities for longer-term emissions reductions (e.g., through decarbonisation of electricity systems) which can form part of a Games legacy [3].

While a number of sustainability assessments exist for infrastructure investment decision-making [4,5,6,7,8,9,10,11], the evaluation of carbon offsets and emissions reduction measures for mega-events has not been proposed in the literature, especially in the context of Net Zero and Climate Positive commitments. The research questions that this paper seeks to address are two-fold: firstly, how can carbon offsets and emissions reduction measures be evaluated from a sustainability perspective? And secondly, for the case of the Brisbane 2032 Olympic and Paralympic Games, which combination of these levers is likely to maximise sustainability and its social, economic, and ecological dimensions? This paper addresses these questions by developing a novel sustainability assessment, and then evaluating three potential scenarios for Brisbane 2032 Games delivery, with varying combinations of offsets and renewable energy.

1.2. Brisbane 2032 and Its Climate Positive Commitments

Brisbane is a city of 2.5 million people on the east coast of Australia, capital of the state of Queensland, and part of a wider conurbation in Southeast Queensland of 3.5 million. The city has held ambitions of hosting the Olympic and Paralympic Games since its successful 1982 Commonwealth Games and 2001 Goodwill Games, and prepared and submitted a bid to host the 1992 Summer Olympics. Brisbane stands out from larger, more well-known cities that have been awarded the Summer Olympics recently, including London (2012), Rio de Janeiro (2016), Tokyo (2020–2021), Paris (2024) and Los Angeles (2028). The success of Brisbane’s 2032 bid, and its future success in Games delivery and legacy benefits, may pave the way for other mid-size cities around the world to host Summer Olympic and Paralympic Games [12].

Brisbane started to prepare its Olympic and Paralympic Games bid through a pre-feasibility study in 2016 [13]. In 2018, the 132nd session of the IOC made major reforms to Games bidding processes and hosting expectations, encouraging more transparency and a lower-cost, more flexible and sustainable delivery model—known as Olympic Agenda 2020—The New Norm [1]. The New Norm encouraged future Games bids to align with long-term development goals of the host region, use existing and temporary venues, and allowed the hosting of events over a wider geographical area than in previous Games [1]. These reforms were critical for Brisbane, allowing organisers to advance planning of a Games bid involving the wider conurbation of Southeast Queensland with its many existing stadia (including those built for the Gold Coast 2018 Commonwealth Games). With the COVID-19 pandemic creating a highly uncertain global environment (including the unprecedented postponement of the Tokyo 2020 Games to 2021), Brisbane’s advanced bid represented a high degree of stability and certainty for the IOC [14]. At the 138th session of the IOC in June 2021, a full 11 years before the event, Brisbane was awarded the rights to host the 2032 Olympic and Paralympic Games.

In March 2020, the IOC announced that all future Olympic Games will be Climate Positive from 2030. This was intended to “lead both the global effort to combat climate change and to leave a tangible, positive legacy for the planet” [15]. As the next host city awarded the Games after this announcement, Brisbane 2032 is thus the first to have committed to this Climate Positive outcome, via its Host Contract [16,17]. Delivering a Climate Positive Olympic and Paralympic Games means going beyond Net Zero, a concept where emissions of greenhouse gases to the atmosphere are balanced by compensation (via carbon capture and offsets) [18]. Climate Positive goes beyond this balance by compensating for more than 100% of the residual emissions related to Olympic activities [19]. This concept is illustrated in Figure 1. Specifically, the IOC defines Climate Positive as:

• Minimising and compensating the direct and indirect emissions related to the Games.
• Implementing long-term zero-carbon solutions for the Olympic Games and beyond.

Details of the extent of minimising (via emission reduction measures) and compensating (via carbon offsets) for Brisbane 2032 are currently under development [19]. The IOC’s reference to long-term zero-carbon solutions implies a legacy element in the delivery of a Climate Positive Games. Thus, the trade-offs in the minimisation/compensation mix warrants examination from a sustainability and legacy perspective.

The long lead time of Brisbane 2032 provides the opportunity to create a positive legacy to accelerate Queensland’s emission reduction and renewable energy targets [20]. The Brisbane 2032 bid documents [20,21] contain a commitment to minimise Games’ emissions as much as possible. In response, the IOC accepted a Climate Positive delivery plan [14] which contains emissions reduction and renewable energy targets for Queensland:

• 50% renewable energy by 2030.
• An economy with zero net emissions by 2050, with an interim target to reduce emissions by 30% below 2005 levels by 2030.

The use of carbon offsets is an increasingly popular tool for organisations and nations in efforts to achieve Net Zero carbon emissions by 2050, a key commitment of the Paris Climate Agreement [22]. Offsets have been embraced by the IOC as a Climate Positive action at an organisational level, including the announcement of the establishment of an Olympic Forest [15]. Plantation forests have been referred to as part of Brisbane’s delivery of a Climate Positive Games [23].

However, carbon offsets are viewed as the lowest priority of the carbon management hierarchy [24]. Some argue that carbon offsets provide a mechanism for organisations and nations to continue Business-As-Usual emissions, rather than reducing emissions at the source [25,26]. Offset projects are varied and can have considerable costs, including carbon-capture and storage (CCS), forestry sequestration, as well as carbon credits generated from external entities such as energy efficiency measures and renewable energy projects. There are also risks and controversies with a number of offset types. In plantations, carbon sequestration can be slow and can be affected by natural disasters such as bush fires and droughts [3]. In addition, the concept of offsets derived from avoiding vegetation clearing can be nebulous [27].

1.3. Sustainability and Carbon Management in the Olympic and Paralympic Games

The Olympic Agenda 2020—The New Norm was the IOC’s response to address and minimise the impacts of the Olympic Games on the environment. Its follow-up plan, Olympic Agenda 2020 +5 [28], commits to the delivery of Climate Positive Olympic Games by 2030 at the latest. However, scholars such as Gold and Gold [29] have commented that the IOC has failed to provide a coherent definition of the dimensions of sustainability and have noted a persistent gap between rhetoric and reality in the sustainability commitments of the Olympic host cities. This has been compounded by the complexities of the evolving notion of sustainability in mega-events [11]. Some scholars consider that mega-events such as the Olympic Games, with their large infrastructure, travel, and operational requirements, are impossible to be truly sustainable—and as such, sustainability claims are pursued more as a branding and “greenwashing” exercise [30]. Others consider that such events, with defined scopes, provide an opportunity to exercise agency by host governments to achieve sustainability outcomes. Such events may also provide an opportunity to showcase innovations and can effectively mainstream sustainability practices in local and global realities [31]. Increasingly, sustainability outcomes are seen as a key component of the legacy outcomes of the Olympics [32,33,34]

Climate impacts of the Olympics and Paralympics have been actively measured since the 2010 Winter Games in Vancouver [35]. An increasing convention in Olympic Games sustainability reporting (pre- and post- Games) is to separate emissions into three distinct categories:

• Construction: This includes construction of stadia (new, temporary, or refurbished), athletes’ villages, training facilities, and broadcasting and press centres, as well as infrastructure developments such as public transport, electricity, waste, water, and communication networks. A large proportion of construction emissions arise from material choices [12].
• Operations: Associated with the organisation and running of the Games which includes overlay, electricity, and fuel usage as well as domestic and international transport and accommodation of “Games family” (athletes, IOC members, media, and the non-resident workforce).
• Spectators: international and domestic transport of spectators to the host city, and accommodation, transport, and food while they are in the city.

These three emission sources, and any accompanying offsets, together form a carbon budget for the host city. Figure 2 shows the carbon footprints of Summer and Winter Olympic and Paralympic Games since 2008, based on official sustainability reports from the associated Olympic committees. Summer Olympics tend to have a significantly greater carbon footprint due to higher numbers of athletes and visitors (generally up to half a million people per Games), larger stadia and more extensive transport infrastructure [36]. The figure shows that carbon offsets have been employed as a key carbon management tool since the 2014 Winter Olympics in Sochi, Russia [37]. In the Sochi Games, carbon neutrality was achieved by offsets derived from sustainable farming and energy efficiency measures. Rio de Janeiro’s hosting of the 2016 Summer Olympics had a high number of spectators [38], resulting in high associated emissions. It also had an extensive compensation program through reforestation, with more than 24 billion trees planted, capturing 202 million tonnes of carbon dioxide (Mt CO₂) [39].

The Tokyo Olympic and Paralympic Games, planned for 2020, were severely disrupted by the global COVID-19 pandemic and re-scheduled to 2021. The pre-Games emissions estimations [2] provide a useful reference point in the running of a modern Olympics. The Tokyo Games committed to prioritising renewable energy and had an extensive offset program to compensate unavoidable emissions. Zero-emission vehicles, including hydrogen cars, were a feature of the official fleet in Tokyo. The Tokyo Games were held in 2021 with no spectators due to COVID-19 restrictions; this resulted in these Games being the most ecologically friendly to date [44]. The use of cap-and-trade programs and emissions trading schemes meant that offsets over-compensated emissions by 2.42 Mt CO₂, resulting in the Games in 2021 being Climate Positive [41].

Carbon neutrality is the objective of the Beijing 2022 Winter Olympic and Paralympic Games, which committed to using 100 per cent renewable energy for all Olympic venues [43]. Currently, only pre-Games estimates of offsets compensating for expected emissions are available.

Paris 2024 is the first Olympic and Paralympic Games to fully implement Olympic Agenda 2020, and is committed (although not obliged contractually) to deliver a Climate Positive Olympic and Paralympic Games [45]. The Games aim to limit emissions to 1.5 Mt CO₂ (less than half that of London 2012’s 3.3 Mt CO₂) and 95% of its venues will be existing or temporary. Paris 2024 also plans to be the launchpad of innovations in technologies to reduce emissions [42], including a digital interactive virtual venue that will reduce the need for physical visits by stakeholders and spectators [46]. Looking further ahead, Milano Cortina’s 2026 Winter Games and Los Angeles’ 2028 Summer Games have committed in their Host City contracts to achieve carbon neutrality [15]. The FIFA World Cup 2022, held in Qatar, committed to deliver a carbon neutral event by advancing low-carbon solutions, implementing numerous energy efficiency practices, and notably, had a large reliance on carbon offsets via tree plantations [47,48].

1.4. Contribution of the Study

Increasingly, the hosting of mega-events such as the Olympic Games includes sustainability commitments such as Net Zero or Climate Positive [11]. While there are sustainability assessment tools in literature for infrastructure, there are no specific event-orientated assessments to facilitate decision-making around the two principal levers for mega-event carbon management, emissions reductions (minimisation) and carbon offsets (compensation). This paper addresses this gap by developing a sustainability assessment model, providing a novel contribution to assess decisions regarding economic, social, and environmental legacies.

The paper then applies this model to Brisbane 2032, where sustainability planning is in its early stages. The Brisbane 2032 host website states, “Brisbane 2032 aspires to create a legacy for the people of Queensland and Australia by leveraging … the Games as a catalyst to enhance social, economic, and environmental outcomes for our communities.” [49]. This study may be able to contribute to, and influence, the discussions about the Climate Positive strategy for Brisbane 2032, and the broader discourse about the composition of Net Zero strategies for events, companies, and governments.

2. Materials and Methods

2.1. Methodology Overview

The methodological steps used in this study are outlined in Figure 3. The overarching method is through document analysis. The first research question concerning the sustainability assessment of mega-events, is addressed through two steps: the development of the sustainability assessment model, and the scorecard framework for sustainability dimensions. The other steps address the specific case study of the Brisbane 2032 Olympic and Paralympic Games, including the development of scenarios for Climate Positive delivery, and emissions assumptions.

2.2. Sustainability Assessment Model

The development of a novel methodology is aligned to the first research question of this study: namely, how can carbon offsets and emissions reduction measures be evaluated from a sustainability perspective? The assessment comes from a technology determinism perspective, where the combination of technologies chosen (in this case, renewable energy infrastructure and carbon offsets) will determine societal outcomes, which are manifest in three dimensions of sustainability: social, economic, and ecological.

In examining previous literature, a number of studies have considered the assessment of sustainability of energy systems and events. As shown in

Table 1. Recent studies on sustainability assessments.

Study	Aim & Scope	Scenario Analysis	Sustainability Indicators	Scoring and Integration of Indicators
Defining a quantitative framework for evaluation and optimisation of the environmental impacts of mega-event projects [4]	Environmental impacts of the whole life cycle of a mega-event focussing on greenhouse gas (GHG) emissions.	3 scenarios	Total: 1 Environmental (CO2 emissions)	Mathematical model; Sum of multiple indicators
Measuring the Environmental Sustainability of a Major Sporting Event: A Case Study of the FA Cup Final [5]	Measuring environmental sustainability through the estimation of ecological footprint of a national sporting event	3 scenarios	Total: 1 Ecological: 10	Subjective scoring of indicators from quantitative data; Integration of indicators
Environmental and economic appraisal of power generation capacity expansion plan in Nigeria [6]	Analysis of the implications of energy policy and a life cycle environmental and economic analysis of the current and future electricity sector.	4 scenarios	Total: 13; Environment: 10; Economic: 3	Life cycle assessment through system modelling. Score based on the impact on the environment. No integration of indicators.
Sustainability assessment of energy systems: integrating environmental, economic, and social aspects [7]	Generic decision-support framework for integrated sustainability assessment of energy systems—environmental, economic and social aspects considered in parallel.	11 scenarios	Total: 17; Environmental: 10; Economic: 3; Social: 4	Multi attribute value theory; integration of sustainability indicators for decision making.
The Evolution of the Sustainability Assessment Tool: From buildings to built environment [8]	Assessment tool to guide cities and urban areas to become more sustainable using reference projects and best practices.	Not applicable (NA)	Total: 41; Economy: 3; Environmental: 21; Society: 15; Extra: 2.	Comparative scoring; integration of indicators
A model for measuring the environmental sustainability of events [9]	Evaluation of sustainability of mega-events using an online platform measuring environmental factors.	NA	Total: 9 Environmental: 9	Indexed scoring; no integration of indicators
Olympics’ Impacts in Rio de Janeiro´s Urban Sustainability [10]	Sustainability assessment of the urban transformation of Rio de Janeiro through comparative analyses of sport mega-events.	NA	Total: 20; Physical: 4; Environmental: 5; Economic: 4; Social-Cultural: 7.	Subjective scoring system, no integration of indicators
An evaluation of the sustainability of the Olympic Games [11]	Event analysis of sustainability of Summer and Winter Olympic Games (1992–2020) using a conceptual model.	NA	Total: 9; Ecological: 3; Economic: 3; Social: 3	Subjective scoring system, equal weighting of indicators
Current Study	Sustainability assessment of carbon offsets and renewable energy for Brisbane 2032 Olympic and Paralympic Games.	3 scenarios to deliver Climate Positive commitments	Total: 6; Ecological: 2; Economic: 2; Social: 2	Subjective scoring system, equal weighting of indicators

, they vary across system boundaries, methodologies, and approaches. From the literature review, five sustainability assessments have been used in mega-events such as the Olympic Games. Three assessments [4,5,6] focussed solely on environmental aspects of sustainability, whilst one assessment [10] used qualitative approaches and did not consolidate the sustainability dimensions into a score. Another, authored by Müller et al. [11] developed a conceptual model to evaluate the sustainability of previous Olympic Games and is further discussed below. None of the examined studies considered carbon offsets in the assessment of sustainability. Thus, the literature review showed that there is a gap regarding sustainability assessment methodology for evaluating both emission reductions and offset actions for discrete mega-events.

Considering this review, a novel sustainability assessment model has been developed and applied in this study, which builds on many of the concepts introduced by Müller et al. They define “Sustainable Olympic Games” across three dimensions: a limited ecological and material footprint; improving social justice outcomes; and improving economic efficiencies. By equally weighting the three dimensions, Müller et al.’s definition and subsequent model occupies a “middle ground” between stronger notions of sustainability (which prioritise ecological limits over social and economic improvements) with weaker notions that may have a greater focus on social and economic development. This principle is consistent with the Sustainable Development Goals and the Paris Agreement [11].

Müller et al.’s model provides a systemic longitudinal approach to evaluate the sustainability of mega-events, based on the evaluation of post Games data. This model enabled comparison of 16 editions of the Summer and Winter Olympic Games between 1992 and 2020. In this present study, aspects of Müller et al.’s model have been modified to develop a new sustainability assessment model to compare Climate Positive scenarios of the same event (the Brisbane 2032 Olympic and Paralympic Games). The number of indicators used to evaluate each dimension has been reduced from three to two (due to relevancy), and in some cases, indicators have been substituted (due to availability of data).

This study undertook two steps to ensure the model’s validity. First, content validity was ascertained by determining whether each of the indicators in the model was relevant for assessing the sustainability of a Climate Positive Games. Second, attribution validity was checked by ensuring that the value assigned to each indicator could plausibly be attributed to the scenarios considered. Figure 4 presents the sustainability assessment model, its dimensions, and indicators.

Based on the six indicators, a detailed score card was developed (Section 2.4) to apply the sustainability model for the case of Brisbane 2032. Each scenario was then scored via the six indicators on a scale from 0 to 100, where 0 means ‘least sustainable’ and 100 ‘most sustainable’. To do this, the evaluation uses statements and estimates from the Brisbane 2032 bid documentation, and a baseline of emissions estimations from London 2012 and Tokyo 2020 (compiled prior to the rescheduling of these Games) (see Appendix A,

Table A1. Emissions from previous Olympic Games used for Brisbane 2032 calculations [2,39,40,41].

Olympics		London 2012	Tokyo 2020	Average London & Tokyo
Unit		KtCO2	KtCO2	KtCO2
Construction	Permanent Venues	1442	336	336
	Olympic Stadium		311	311
	Olympic villages		553	553
	New venues (Temporary Parts)		83	83
	Temporary Venues		89	89
	Existing Venues		127	127
	Others	588		392.5
	TOTAL	2030	1499	1765
Operations	Overlay	47	11	29
	Venue energy consumption	60	17	38.5
	Torch relay	1	3	2
	Media (IT Services)	37	44	31
	Games workforce and athletes	15		7.5
	Accommodation	16	202	16
	International Travel—Games Family			138
	Domestic Air Travel—Games Family
	Domestic non-air Travel—Games Family
	Transport Services	11
	Transport Grant	31
	Ceremonies	5	25	15
	Security		26	13
	Medical		11	5.5
	Advertisement and publicity		13	6.5
	Commemorative coins		2	1
	Medals		0.1	0.5
	Furniture, fixtures, and Equipment	38		38
	Logistics		20	10
	Others	50
	TOTAL	311	374	343
Spectators	Accommodation	883	168	168
	Food	8838	30	30
	Shopping (Officially Licensed goods)		49	49
	International Travel		610	505
	Domestic Air Travel		6100	8
	Domestic non-air Travel	97		97
	Others
	TOTAL	988	857	923
OVERALL		3329	2730	3030

). The assessment uses both qualitative and quantitative data, with justifications and references to literature.

2.3. Scenarios and Emissions Estimations

With the mix of emissions reduction (minimisation) and carbon offset (compensation) measures still in the planning stages for Brisbane 2032 Games, this paper sets out three Climate Positive scenarios, that are then evaluated using the sustainability assessment model. The three scenarios have been named after Olympic track-and-field throwing events (shot put, discus and javelin), to highlight the notion of ambition and achievement in a defined field of play. The scenarios names also align the extent of emissions reduction measures (predominantly via the deployment of new renewable energy infrastructure) with the typical distances thrown in each event. Details of these scenarios are presented in

Table 2. Key assumptions made across the study’s three scenarios.

	Scenarios
Category	SHOT PUT	DISCUS	JAVELIN
Construction	80% of venues, existing or temporary New construction of 20% of venues with current standards 2022 electricity mix used in construction	80% of venues, existing or temporary New construction of 20% of venues, with Green Star rating of 6 stars, using 100% renewable energy New construction of renewable electricity infrastructure to achieve 2030 electricity mix (50% renewable), using 2022 electricity mix	90% of venues, existing or temporary New construction of 10% of venues, with Green Star rating of 6 stars, using 100% renewable energy New construction of renewable electricity infrastructure to achieve 100% renewable electricity, using 2022 electricity mix
Operations	2022 electricity mix used in Games operations 2022 Queensland energy mix used in Games Family transport Regular 2022 international and domestic air travel by Games Family	2030 electricity mix (50% renewable) used in Games operations Zero emissions Games Family transport Regular 2022 international and domestic air travel by Games Family	100% renewable electricity used in Games operations Zero emissions Games Family transport 80% lower emissions from domestic air travel due to the use of SAF. Regular 2022 emissions from international air travel.
Spectators	2022 electricity mix used for spectator’s activities 2022 Queensland energy mix used in Games public transport Regular 2022 international and domestic air travel	2030 electricity mix (50% renewable) for spectator’s activities 2030 electricity mix used in Games electrified public transport Regular 2022 international and domestic air travel	100% renewable electricity used for spectator’s activities Zero emissions public transport 80% lower emissions from domestic air travel due to the use of SAF. Regular 2022 emissions from international air travel.

and discussed below.

The Brisbane 2032 bid documents form a base-case scenario, labelled DISCUS, which centres around the Queensland Government’s commitments to transition the state to 50% renewable energy, and reduce emissions by 30% of 2005 levels, by 2030. Regarding transport, the bid documents commit to operating a carbon-neutral Games fleet for client groups and have targeted 90% of the spectator travel in the Games region to be via public and active transport. In this scenario, the bid documents commit to 80% of Games venues being existing or temporary, and all new infrastructure having a 6-star Green Star rating [50,51]. The emissions intensity from spectator travel (flights, etc.) remains high, requiring significant carbon offsets to achieve a Climate Positive outcome.

From this base case scenario, a scenario is considered in which emissions reductions are maximised via a range of measures, including the complete decarbonisation of Queensland’s electricity network—by retiring fossil fuel generation systems and investing in renewable energy. This scenario, labelled JAVELIN, is more radical, pushing the boundaries of what can be practically achieved in the wider host state, Queensland. The JAVELIN scenario produces larger legacy benefits in the area of infrastructure—using the Games to accelerate the transition to a zero-emissions system to power the entire state [52,53].

The decarbonised electricity system would result in zero emissions of Games operations at venues and the region’s domestic transport system. This scenario requires significant material consumption in the construction of new renewable energy infrastructure. Games venues would target a 90% usage of existing facilities, and all new infrastructure would have a 6-star Green Star rating [50,51]. It was assumed that aviation emissions in this scenario would be further reduced through the use of Sustainable Aviation Fuels (SAF) in all domestic aviation services during the Games [54,55,56]. The use of SAF in international aviation services was considered to be beyond the control of the Games organisers. Overall, even in this optimistic JAVELIN scenario, the use of carbon offsets will be required to achieve a Climate Positive Games.

The SHOT PUT scenario is based on the energy mix of Queensland in 2022, essentially representing a ‘do-nothing’ or status-quo situation. It was felt that including this scenario, which sees no changes to the Queensland energy mix and transport facilities between now and 2032, illustrates an extreme scenario of higher emissions-intensive Olympic Games, supplemented by greater carbon offsets to achieve Climate Positive. New venues would be constructed using existing building standards, for example. The extended workings and data sources for emissions estimations are available in the Appendix A (

Table A2. Brisbane 2032 emissions estimation for SHOT PUT, DISCUS & JAVELIN scenarios.

Olympics	Indicator	SHOT PUT	Comments	DISCUS	Comments	JAVELIN	Comments
Unit		KtCO2		KtCO2		KtCO2
Construction	Permanent Venues	356.16	10% of the emissions are due to the electricity usage during construction. This value is multiplied by the difference in the emissions intensity (1.6x the average emissions)	124.66	Using 6-star rating produce 65% fewer greenhouse gas emissions than average Australian buildings.	124.66
	Olympic Stadium	329.66		115.38		0.00	No upgrade of main stadium
	Olympic villages	586.18		205.16		205.16
	New venues (Temporary Parts)	87.98		30.79		30.79
	Temporary Venues	94.34		33.02	100% renewable electricity used in Games construction	33.02
	Existing Venues	134.62		47.12		47.12
	Others	416.05
	TOTAL	2004.99		556.13		440.75
Operations	Overlay	30.74	Overlays are temporary structures similar to construction	27.67	Overlays are temporary structures similar to construction	27.67	Overlays are temporary structures similar to construction
	Venue energy consumption	61.60	2022 electricity mix used in Games operations with 20% current Renewable Energy mix (1.6x the average emissions).	38.50	2030 electricity mix (50% renewable) used in Games operations	0.00	100% renewable electricity used in Games operations
	Torch relay	3.20	Activity considered to have 10% embodied electricity usage (1.6x the average emissions).	2.00		0.00
	Media (IT Services)	49.60		31.00
	Games workforce and athletes	12.00		7.50
	Accommodation	25.60		16.00		0.00
	International Travel—Games Family	113.83	The ratio of emissions is assumed to be the same as the ratio of Spectators transport emissions.	113.83		113.83
	Domestic Air Travel—Games Family	1.80		1.80		0.36	SAF imple-mentation by airlines (e.g., Qantas) reduces emissions by 80%
	Domestic non-air Travel—Games Family	21.86		0.00	Zero emissions Games Family local transport	0.00	Zero-emissions Games Family transport
	Transport Services
	Transport Grant
	Ceremonies	24.00	Every activity considered to have 10% embodied electricity usage which is 1.6 intense than average emissions.	15.00		0.00	100% renewable electricity used in Games operations
	Security	20.80		13.00		0.00
	Medical	8.80		5.50		0.00
	Advertisement and publicity	10.40		6.50		0.00
	Commemorative coins	1.00		0.63		0.00
	Medals	0.50		0.31		0.00
	Furniture, fixtures, and Equipment	60.80		38.00		0.00
	Logistics	16.00		10.00		0.00
	Others
	TOTAL	462.54		327.24		141.86
Spectators	Accommo-dation	268.80	Every activity considered to have 10% embodied electricity usage which is 1.6 intense than average emissions.	168.00	2030 electricity mix (50% renewable) for spectator activities	0.00	100% renewable electricity used for spectator activities
	Food	48.00		46.20	Change in electricty mix affects 10% of food emissions, with the remainder unchanged (embodied).	43.20	Change in electricty mix affects 10% of food emissions, with the remainder unchanged (embodied).
	Shopping (officially licensed goods)	78.40		75.46		70.56
	International travel	505.00	Regular 2022 international and domestic air travel by Games Family	505.00		505.00
	Domestic air travel	8.00		8.00		1.60	SAF used in domestic air travel by spectators,
	Domestic non-air travel	97.00		97.00		0.00	Zero emission domestic public transport
	Others
	TOTAL	1005.20		899.66		620.36
OVERALL		3473		1783		1203

,

Table A3. Data Scoring Sources.

Dimensions	Indicators	Units	SHOT PUT	DISCUS	JAVELIN
Ecological	Recourses Consumption	Estimated emission levels (Mt CO2)	[14,15,16,20,51,82]
	Land Required/disturbed	Land required for plantations (thousands of hectares)	[65,83,84]
		Land required for renewable energy generation (thousands of hectares)		[69,85,86]
Social	Social equity/Job creations	Offset Jobs	[84,87]	[72,84,88]	[67,72,89]
		RE Jobs
	Public approval	Percentage	[84,90]	[67,72,91]	[66,92,93]
Economic	Budget balance	Cost of ACCU/plantations ($ Million)	[94,95]	[88,91,94]	[89,94]
		Cost of new renewable energy infrastructure ($ Million)
	Long-term viability	Percentage of new renewable energy infrastructure	[3]	[91,93]

,

Table A4. Land required for plantations.

Scenarios	Residual Emissions (kt CO2)	Land Required (ha)
SHORT PUT	3473	996,674
DISCUS	1783	511,729
JAVELIN	1203	345,251

Assumption: Land required for Plantations: 0.287 ha/year required to sequester 1 t CO₂ [65].

,

Table A5. Land required for renewable energy installation.

Scenarios	Renewable Electricity Target (%)	Capacity (MW)	Land Required (ha)
SHORT PUT	20	0	0
DISCUS	50	5500	16,500
JAVELIN	100	20,000	60,000

Assumption: Land required for renewable energy generation: solar farm requires 3 ha per MW of installed capacity [86].

,

Table A6. Cost required for plantation in terms of ACCU.

Scenario	Residual Emissions (ktCO2)	Cost ($ million)
SHORT PUT	3473	122
DISCUS	1783	62
JAVELIN	1203	42

Assumption: Cost equivalent to Australian Carbon Credit Units (ACCUs), $35/tCO₂ [94].

,

Table A7. Cost of renewable energy infrastructure.

Scenarios	Renewable Electricity Target (%)	Capacity (MW)	Cost ($ million)	Sources
SHORT PUT	20	0	0
DISCUS	50	5500	10,900	[88,91]
JAVELIN	100	20,000	25,000	[89]

,

Table A8. Number of jobs created through plantations.

Scenarios	Residual Emissions (ktCO2)	Number of Jobs
SHORT PUT	3473	174
DISCUS	1783	89
JAVELIN	1203	60

Assumption: Jobs created through plantations: Carbon Offset = 25–50 jobs per MtCO₂ abated [84].

and

Table A9. Legacy renewable energy infrastructure: capacity, cost and emissions abated.

Scenarios	Capacity Required to Abate Eesidual Emissions (MW)	Cost of Infrastructure ($ million)	Emissions Abated (MtCO2)
DISCUS	800	864	1.91

).

All scenarios have several assumptions in common. Firstly, it is assumed that carbon offsets will be achieved by new tree plantations planted over several years, in the state of Queensland. Secondly, it is assumed that emissions from international aviation were unavoidable and constant across all three scenarios. It is assumed that in 2032, there will similar aviation emissions as in 2022, except for decarbonised domestic aviation in the JAVELIN scenario. The underlying assumption across all scenarios was that emissions reduction would occur to the maximum extent possible, before compensating for the residual emissions through offsets.

Emissions Assumptions

For each of the scenarios, detailed assumptions across the aspects of construction, operations, and spectators were considered, allowing the evaluation of the three dimensions of sustainability and their corresponding indicators. A key bid document for Brisbane 2032, the Future Host Commission Questionnaire Response [14], provides preliminary details of climate and carbon commitments. These include a commitment to calculate the Games’ carbon budget using the IOC carbon footprint methodology (2018); to use an independent Climate Active registered consultant to monitor and verify carbon management; and to publicly disclose emissions reduction measures and a registry of carbon offsets. The Questionnaire Response and other bid documentation do not contain any data on estimates of energy use or emissions, and their resultant carbon footprint. Thus, previous host cities’ emissions data is used to inform the estimation of Brisbane 2032 emissions, initially under the SHOT PUT scenario of 2022’s emissions intensity, and then extrapolated to DISCUS and JAVELIN scenarios.

Emissions data for Olympic and Paralympic Games are estimated in pre-Games reports, and actual emissions are reported in post-Games reports. Since 2018, this reporting has generally followed the IOC carbon footprint methodology [57]. However, disaggregated emissions data have also been reported for earlier Games, including Beijing 2008 and Vancouver 2010 [58,59]. One of the issues with the disaggregated emissions data from pre- and post-Games sustainability reports is that the categorisation of emissions has lacked consistency between Games hosts. Thus, using two or more Games hosts’ emissions data has helped to triangulate Brisbane 2032 estimates.

The Council of Mayors’ Feasibility Study [60] states that Brisbane 2032 Games delivery will use London 2012 as a benchmark, including energy policy and demand, Games operations plans, venue capacities and design principles. Total emissions for London 2012 (before offsets were considered) were 3329 kilo-tonnes (kt) CO₂ [40]. The most recent Games, in Tokyo, were projected to have similar total emissions (before offsets), of 2730 kt CO₂ [2]. The 2016 Summer Olympic and Paralympic Games in Rio de Janeiro had higher emissions (before offsets) than Tokyo 2020 and London 2008 and did not follow their distribution patterns – and thus, data from Rio 2016 is not used to inform Brisbane emissions estimations. The emissions intensity in the United Kingdom during London 2012 was 0.46 t CO₂/megawatt-hour (MWh) [61]; while in Japan during the Tokyo Games, emissions intensity was 0.506 t CO₂/MWh [62]. These are lower than Queensland’s emissions intensity in 2020 (0.78 t CO₂/MWh [63]). Based on this data, this study assumes that Brisbane 2032’s emissions (before offsets) under the status-quo SHOT PUT scenario will be 3665 kt CO₂.

Generally, projected emissions data for the three scenarios considered for Brisbane 2032 were based on pre- and post-Games sustainability reports for London 2012 [40,64] and Tokyo 2020 [2,41]. London and Tokyo had similar emissions patterns across the three categories of Games delivery (Construction, Operations and Spectators), and thus formed the basis for the breakdown of the SHOT PUT scenario for Brisbane 2032. This was supplemented with statements and parameters collected from official reports and press releases on Brisbane 2032.

2.4. Scoring

To evaluate the sustainability level of the three Brisbane 2032 Climate Positive scenarios, three sustainability dimensions (ecological, social, and economic) and six associated indicators were used. The study considers the economy wide changes to achieve each scenario’s outcomes, e.g., state-wide energy system infrastructure improvements. The dimensions, indicators and variables are summarised in the scorecard framework presented in

Table 3. Scorecard framework for sustainability dimensions.

Dimension	Indicator	Proxy Variable	Units	Scoring	Plausibility of Proxy Variable/Assumption	Justification of Proxy Variable
Eco-logical	Resource Management	Estimated CO2 emissions from energy consumption	kt CO2	100: 0–1.0 80: 1.0–1.5 60: 1.5–2.0 40: 2.0–2.5 20: 2.5–3 0: >3.0	Medium	CO2 emissions give an estimate of the resources used in energy generation and include estimates of emissions from new construction and material footprints.
	Land Manage-ment	Land required for electricity generation and carbon offsets	Thousands of hectares	100: 0–250 80: 250–500 60: 500–750 40: 750–1000 20: 1000–1250 0: >1250	High	Indication of land disturbed for either new electricity infrastructure or plantation forests for carbon offsets.
Social	Social equity	Jobs created for electricity generation and carbon offsets	Jobs	100: ≥15,000 80: 12,000–15,000 60: 10,000–12,000 40: 8000–10,000 20: 4000–8000 0: 0–4000	Medium	Jobs represent the public-facing manifestation of social inclusion, with many Government projects using this metric.
	Public approval	Support levels (%) from public surveys	Percentage	100: >90%; 80: 80–90% 60: 60–80% 40: 40–60% 20: 20–40% 0: 0–20%	High	Public approval plays a significant role in influencing political will and sustainability of any initiative over time.
Economic	Budget balance	Cost of additional renewable energy infrastructure and offsets to achieve Climate Positive Games	Cost of Australian Carbon Credit Unit ACCU ($ million)	100: 0–1000 80: 1001–5000 60: 5001–10,000 40: 10,001–15,000 20: 15,001–20,000 0: >20,000	High	Additional infrastructure required is relatively easy to quantify.
			Cost of new renewable energy infrastructure ($ million)
	Long-term viability	After use of new infrastructure—renewable electricity generation in system	Percentage of renewable electricity generation in Queensland system	100: 81–100%; 80: 61–80% 60: 41–60% 40: 21- 40% 20: 11–20% 0: 0–10%	Medium	Plantation trees provide a one-time offset, and thus no after-use value at tree maturity which can be quantified easily. Thus after-use level is based on the renewable energy infrastructure installed, with an assumed lifetime of 30 years.

. For most indicators, proxy variables were used to provide meaningful data. The table provides commentary on the levels of plausibility of these proxy variables, as well as their relationship to sustainability. The scoring method has been developed specifically for this study and the Brisbane 2032 context. Each proxy variable’s score is scaled from 0 to 100 (in increments of 20) based on data derived for Brisbane 2032.

The ecological dimension is composed of resource management (estimated emissions from energy consumption) and land management (land required for energy generation and carbon offsets—calculated based on data of the annual net changes in carbon stock [65]. These are determined for each scenario based on the facilities, penetration of renewable energy and alternative fuel usage in powering venues and the transition towards more sustainable transport.

The social dimension is composed of Social Equity and Public Approval indicators. Proxy data for Social Equity was based on the estimated jobs created under each scenario, while Public Approval scores were estimated by polls and policy surveys in Australia. Finally, the economic dimension includes a Budget Balance indicator (based on the cost, in Australian dollars, of additional renewable energy infrastructure and carbon offset plantations) and a Long-term Viability indicator. Cost data was collected from various Queensland Government reports related to future investments in the Emission Reduction Fund and the Land Restoration Fund. Long-term Viability was estimated based on the degree of anticipated after-use of infrastructure and facilities. Detailed calculations and information sources are included in the Appendix A of this paper.

3. Results

A visual overview of the results of the scoring of each scenario against the indicators is shown in Figure 5, and a bar chart of the results is shown in Figure 6. Further,

Table 4. Data and sustainability assessment model scorecard for various scenarios.

Indicator	Proxy Variable	Unit	SHOT PUT		DISCUS		JAVELIN
			Data	Score	Data	Score	Data	Score
Resource Manage-ment	Estimated CO2 emissions from energy consumption	Estimated emission levels (kt CO2)	3665	0	1692	60	1291	80
Land Manage-ment	Land required for energy generation and carbon offsets	Land required for plantations (k ha)	1052	20	486	60	371	80
		Land required for renewable energy generation (k ha)	0		16.5		60
Social equity	Number of jobs created	Renewable Electricity Jobs	0	0	7900	40	23,000	100
		Offset Jobs	183		85		65
Public approval	Public support (%) for different scenarios of renewable energy and offsets	Percentage	14%	20	78%	80	61%	60
Budget balance	Cost of additional renewable energy infrastructure and offsets	Cost of new renewable electricity infrastructure ($ Million)	0	100	10,900	40	25,000	0
		Cost of plantations ($ Million)	128		59		45
Long-term viability (after use of new infra-structure)	Amount of infrastructure for renewable energy generation	Percentage of renewable energy infrastructure	20%	40	50%	60	100%	100

shows the indicator data and scorecards for each scenario. Overall results show the considerable differences in sustainability dimensions according to the emissions reductions/offset mix of each scenario.

The SHOT PUT scenario, based on the current 2022 electricity mix of Queensland and higher compensation through offsets, scores lowest on the ecological and social dimensions of sustainability. Plantation forests for the offsets will require significant land, leading to a low score for land management. Evidence suggests that a heavy reliance on offsets, when not accompanied by significant emissions reductions, has low public support. In the economic dimension, SHOT PUT requires no additional energy infrastructure, with investment solely in offsets ($122 million) to deliver a Climate Positive Games. This scenario represented the lowest cost option and was scored 100 for the Budget Balance indicator. However, the Long-term Viability of this scenario receives a low score, with the high use of plantation offsets providing only limited longevity, and no additional long-term electricity infrastructure.

The DISCUS scenario, based on the Brisbane 2032 bid documents, calls for continued commitment to Queensland’s emission reduction and renewable energy targets—most notably, the target of 50% renewable energy by 2030 [20]. This gradual increase in renewable electricity capacity, along with the progressive retirement of fossil fuel generation, would still generate 1783 kt CO₂, which would require compensation via offsets. This policy has been part of the election platform of recent Queensland Government elections (as recently as 2020) and enjoys bi-partisan political support; recent surveys have shown that this policy setting has high levels of public support [66,67].

The DISCUS scenario incorporates zero-emissions Games Family transport, but Spectators public transport will still generate emissions. The land area required for generating the additional renewable energy, and the forestry areas required for offsets, reduce the Land Management score of the DISCUS scenario compared with SHOT PUT. The DISCUS scenario requires the Queensland Government’s stated pipeline of infrastructure including 5774 MW of new wind and solar projects, costing $10.9 billion [68]. The cost of offsets in this scenario is estimated at $62 million, producing an overall Budget Balance score of 20. This scenario would deliver around 7900 full-time jobs in new renewables, and 89 jobs in offsets, resulting in a score of 60 for the Social Equity indicator. The Long-term Viability score for the DISCUS scenario is higher than SHOT PUT due to the renewable energy infrastructure to be installed. It was found that DISCUS and JAVELIN scenarios, with new infrastructure constructed to a 6-star Green Star rating, have 65% lower emissions in construction than in the SHOT PUT scenario.

The JAVELIN scenario represents the most ambitious plan, with Queensland’s electricity system moving to zero emissions by 2032. Interestingly, under this scenario the total estimated Games emissions levels (1203 kt CO₂) are not significantly less than the emissions under the DISCUS scenario (1783 kt CO₂). This is because the emissions from aviation transport are unable to be significantly lowered, even with SAFs used in domestic air services. The total land required in this scenario (for plantation offsets and new renewable electricity infrastructure) is less than in the DISCUS scenario—resulting in a higher score for the Land Management indicator.

The JAVELIN scenario scores highest in Social Equity, with estimates of over 23,000 jobs created in the construction of new electricity infrastructure. The new infrastructure required for this scenario will result in expenditure of $25 billion, which results in a low score for Budget Balance. However, the Long-term Viability of this scenario scores high, as it produces a lasting renewable energy infrastructure legacy for the state. It is likely that the significant cost implications will result in lower public approval.

When considering all three dimensions of sustainability, and taking the mean of all indicator scores, JAVELIN (70) is the most sustainable, followed by DISCUS (53) and SHOT PUT (30). Notably, offsets are required to achieve a Climate Positive Games in all scenarios—even in the JAVELIN scenario.

4. Discussion

The findings show that Budget Balance and Social Equity are the two indicators with the highest variability between the three scenarios, underscoring the importance of the “bottom-line” in sustainability and concurring with the findings of similar investigations [19]. This study has assessed sustainability based on the notion of equality across the three dimensions, but the cost implications of the JAVELIN scenario are noticeably high, which may be unpalatable for government and host authorities to implement. The cost implications may create a barrier, that needs to be countered by significant social, ecological and reputational advantages. After the scenario development presented in this study was completed, the Queensland Government announced a plan for 70% renewable energy for the state by 2032 [69]. The selection of the date for this goal is significant, indicating that the Queensland Government is indeed harnessing the momentum of the Olympics, and the global spotlight it provides.

As an alternative, the installation of specific renewable electricity infrastructure that would be additional to the Queensland Government’s 2030 commitments (as set out in the DISCUS scenario) has been examined. This could be in the form of a singular piece of energy infrastructure that could essentially offset residual emissions, whilst further contributing to Games legacy. The DISCUS scenario requires offsets of 1.78 Mt CO₂, which, if delivered by plantation forests, would cost $62 million. The alternative strategy involves the installation of 800 MW of renewable energy infrastructure, which provides the additional abatement of 1.9 Mt CO₂ from the business-as-usual Master Plan and drawing electricity from the national grid. The cost for this additional capacity is around $0.8 billion, based on Queensland’s renewable energy target (5774 MW installed capacity achieves emissions reductions of 13.8 Mt CO₂, with large-scale solar photovoltaic costs of $1441/KW [70]). While high, this is commensurate with the Queensland Government’s 2030 infrastructure plan which has been estimated to cost $10.9 billion.

Arguably, such an investment would have greater legacy benefits than plantation offsets. In their quantitative study, Pálvölgyi et al. [71] concluded that the impact benefits of renewable energy infrastructure were double that of plantation offsets. Also, renewable energy infrastructure has a greater job intensity than plantation forests, and more public support. An “Olympic” solar farm (or similar) would also support the Queensland Government’s energy goals beyond 2030, contributing towards its Net Zero by 2050 target, as well as providing social benefits [36,72]. In a similar way, other operations and facilities have commissioned renewable energy infrastructure to offset electricity consumption. For example, The University of Queensland commissioned a 64 MW solar farm which has allowed the university to generate 100% of its electricity demand from renewable energy, even though the facility is connected to the national grid [73]. Additional emissions reductions could be achieved through various energy efficiency improvements focussing on the built environment, including integration of solar energy and thermal energy recovery systems [74,75].

While the results of this paper’s sustainability assessment of the three Brisbane 2032 Climate Positive scenarios are not readily comparable with previous Olympics using Müller et al.’s model, the results can be contextualised with the relevant trends found in their article. Müller et al. found that despite the IOC adopting policies such as the New Norm, the sustainability of the Olympic Games has decreased over time. This negative trend holds true for all but the economic dimension, with the ecological dimension declining the most. This means that the promotion of the environment and sustainability as a pillar of the Olympic policy agenda has not been able to stop or reverse the decline of sustainability over time.

Brisbane 2032, with its relatively smaller metropolitan region and a plan to run a more decentralised Games, is in many ways more similar to Winter Games hosts than the mega-cities that have (and will, in the near future) host the Summer Games. Notably, Müller et al. found that two Winter Olympic Games were the most sustainable: Salt Lake City, United States, in 2002 and Albertville, France, in 1992.

Limitations of the Sustainability Assessment Model

The methodology and scorecards for the three scenarios are subjective and necessarily arbitrary, and a high score in an indicator was based on an assessment of the relative strength of that aspect of the sustainability dimension, compared with other scenarios. Compromises were necessary in choosing the proxy variables of the indicators, and data was often extrapolated from previous Games, rather than directly sourced. This is because detailed information regarding the implementation of some of the Brisbane 2032 Games’ sustainability concepts was not available at the time of writing.

5. Conclusions and Recommendations

Based on the methodology developed along with the findings for Brisbane 2032, this study has been able to explore and assess the dimensions of sustainability for Climate Positive scenarios involving combinations of minimisation, via increased renewable energy, and compensation, via carbon offsets. The assessment tool developed in this study presents an accessible, indicator-based methodology across three dimensions of sustainability, that can be adapted for other mega-events.

Applying this model to the case of Brisbane 2032 shows that a higher reliance on carbon offsets results in poorer sustainability outcomes for this event. The most sustainable scenario, involving full decarbonisation of the Queensland electricity sector and transport system, involved significant cost implications but is likely to create greater legacy outcomes. While the costs are very high, and there are indications that public approval towards such expenditure might be becoming more favourable [76]. Further, decarbonisation efforts of this scale are required to be delivered in cities and urban environments, if the world is to avoid the worst effects of climate change [77]. These viewpoints, and the international exposure of the Games, have undoubtedly led to the Queensland Government’s announcement of a 70% target for renewable energy by 2032.

This study has also concluded that significant levels of compensation, via carbon offsets, will be required in all scenarios. Offsets do play an important role in Net Zero pathways in global, national, and local carbon budgets, but may reduce the pace of emission reductions, and have additionality, permanence and leakage issues [24,27,78]. In a discrete mega-event like Brisbane 2032 with clear boundaries, an over-reliance on offsets may prevent the true potential of legacy benefits being realised. While carbon offsets are inherent in the term Climate Positive, the potential overall contribution of offsets has been found to be limited in Australia’s pathway to Net Zero [79].

Recommendations

There is a clear opportunity for Brisbane, Queensland, and Australia to harness the momentum of the Olympics, and the contractual obligations of delivering a Climate Positive Games, to maximise sustainable legacies. To contribute to this discussion, this study offers three key recommendations.

Firstly, an improvement in the governance surrounding Climate Positive Games delivery is recommended, by creating an independent committee to develop detailed, credible pathways, and monitor their implementation and resultant emissions. This would improve transparency and confidence, with the IOC and host authorities providing more details on the legacy elements of Climate Positive Games delivery.

Secondly, increasing the level of socialisation and public awareness around the commitment to a Climate Positive Games, its concepts, and legacy benefits, would be beneficial as part of the early stages of Games planning and delivery [72]. This would increase public support for deeper efforts to decarbonise the electricity sector and transport systems as part of the Climate Positive legacy. This could include an ‘additional’ Olympic solar farm as an important step on the pathway to reducing emissions. Successful implementation would highlight the opportunities to fast-track sustainability initiatives as a result of hosting the Games.

Finally, increased engagement is recommended with the private sector, which entirely funds the IOC and the Olympic movement, around Climate Positive activities and efforts. The Olympic Partners (TOP) program grants exclusive marketing rights to multi-national partners, which could be used as a vehicle for increased action (and associated branding) in the Climate Positive space [80]. Substantial reductions in emissions in air transport by corporate partners could leverage the Olympic brand and the Climate Positive label to become a catalyst for wider decarbonisation in the sector.

Overall, the Olympic movement has a track record of influence in using sport and the staging of events to progress attitudes and societies [81]. With Brisbane 2032, the commitment to Climate Positive has the potential to go beyond rhetoric, supporting the transition of sustainable energy and transport systems. The methodologies developed in this study can help track these commitments, as details of the Games’ delivery are developed.