Key points:
- The Brazilian Presidency of COP30 has proposed an ‘Action Agenda’ which includes accelerating the energy transition through an equitable transition away from fossil fuels.
- The IEA’s Net Zero Emissions (NZE) scenario provides a model of how this could be achieved, with emissions from the use of oil and natural gas falling faster in advanced economies.
- Advanced economies need to reduce emissions from oil by 40% by 2030, compared to 20% for emerging and developing economies. For gas, the difference is even greater, with a 33% reduction for advanced economies and a 4% reduction for emerging economies.
- Maintaining ambitious targets is crucial, with models such as the IEA’s Net Zero Emissions scenario highlighting the impact failure to reduce emissions in recent years will have on future emission levels.
COP30 and the equitable transition away from fossil fuels
In 2023, the world’s governments committed for the first time to address the main cause of climate change, the use of fossil fuels. Specifically, the UN COP28 climate summit outcome called for the:
“Transitioning away from fossil fuels in energy systems, in a just, orderly and equitable manner, accelerating action in this critical decade, so as to achieve net zero by 2050 in keeping with the science.”
The Brazilian Presidency of this year’s COP30 climate summit has proposed an ‘Action Agenda’, which includes advancing progress on the COP28 commitment. It calls for “the acceleration of the global energy transition” and “transitioning away from fossil fuels in energy systems in a just, orderly and equitable manner”.
This briefing assesses what international equity means in practice for the transition away from oil and gas, in the context of the COP30 Action Agenda.
Equity at the foundation of international climate action
Equity, the principle of achieving fairness in a way that seeks to address existing inequalities, lies at the heart of international agreements on climate change. It is the first principle of the 1992 UN Framework Convention on Climate Change, which states:
“The Parties should protect the climate system for the benefit of present and future generations of humankind, on the basis of equity and in accordance with their common but differentiated responsibilities and respective capabilities. Accordingly, the developed country Parties should take the lead in combating climate change and the adverse effects thereof.” (emphasis added)
This principle recognises both a country’s historical contribution to climate change, of which developed countries bear the greatest responsibility, and its economic capabilities, which are greater for developed countries.
Countries reaffirmed their commitment to this principle in the landmark 2015 Paris Agreement. In 2025 the International Court of Justice unanimously found that this commitment constitutes a clear legal duty for states:
“States have a duty […] to use all means at their disposal to prevent activities carried out within their jurisdiction or control from causing significant harm to the climate system and other parts of the environment, in accordance with their common but differentiated responsibilities and respective capabilities.” (emphasis added)
To turn this principle and legal duty into practice, advanced economies must phase out the use of oil and gas faster than emerging and developing countries, and in line with the 1.5C temperature goal of the Paris Agreement.
Advanced economies must move faster to phase out the use of oil and gas
The International Energy Agency (IEA) outlined its interpretation of these principles of international law in its Net Zero Emissions (NZE) scenario, which models how countries could meet the Paris Agreement goals. The scenario, first produced in 2021 and revised in 2023, sees CO2 emissions from advanced economies fall to net zero by around 2045, five years ahead of the rest of the world achieving its net-zero emissions goal (see Figure 1).1The IEA defines Advanced economies as the OECD regional grouping and Bulgaria, Croatia, Cyprus, Malta and Romania.
In the NZE scenario’s timeline to net zero, advanced economies need to reduce emissions from the use of oil by 40% by 2030, compared to a 20% reduction for emerging and developing economies. The difference is even more stark for gas, with advanced economies needing to achieve a 33% reduction in emissions, compared to 4% for emerging and developing countries.2ZCA analysis of data from the IEA World Energy Outlook 2024. Emerging and developing economies emissions reductions calculated by subtracting advanced economies emissions from world totals.
Figure 1

The differentiated responsibilities modelled in the IEA’s NZE makes it a useful analytical basis for the different pace of action required for advanced and developing economies as part of an equitable transition away from fossil fuels in the COP30 Action Agenda.
Failure to act is leading to less ambitious reductions by 2030
Since the IEA first published the NZE scenario, global CO2 emissions have risen by 11% from 2020 to 2023, according to its World Energy Outlook. Since the scenario envisioned an immediate reduction in emissions, subsequent editions accommodated this reality with an upward revision to the starting point for future reductions. As a result, the annual updates to the NZE scenario have progressively reduced the level of ambition for emissions reductions by the end of this critical decade.
For advanced economies that need to take the lead in reducing emissions, the 2022 NZE required natural gas emissions to fall by 45% by 2030, from 2021 levels. By 2024 this had fallen to a less ambitious 33% reduction from 2023 levels. For oil, the corresponding figures were a 48% cut in emissions in the 2022 NZE, falling to a 40% cut from 2023 levels in the 2024 NZE.3The IEA first published a breakdown of emissions pathways by region in the 2022 World Energy Outlook, so data is not available from the original 2021 report.
Figure 2

Figure 3

One reason for this lowering of ambition for emission reductions through 2030 is that the IEA has maintained a consistent rate of decline for advanced economies – 7% for oil and 6% for gas – even as the baseline level of current emissions has risen. This means that, rather than meeting the reality of rising emissions with rising ambitions for the pace of reduction this decade, the absolute level of emissions reduction has fallen with each annual revision of the NZE data.
These changes demonstrate the need for urgent action – with delays not only causing greater emissions now, but also leading to either higher levels of emissions or the need for even more rapid reductions in emissions into the future.


