A new scientific study is challenging the way the world measures global warming, warning that current methods may be undervaluing some of the most effective ways to slow climate change particularly efforts to cut methane emissions.
Published in the journal Environmental Research Letters, the research proposes a new framework called Radiative Forcing-based Accounting (RFA), which aims to more accurately capture how different greenhouse gases affect the Earth’s temperature over time. The study has significant implications for climate policy, carbon markets, and the valuation of emissions reduction projects.
For decades, global climate policy has relied on a standard unit known as carbon dioxide equivalent (CO2e) to compare the impact of different greenhouse gases. This system uses a metric called Global Warming Potential over 100 years (GWP100), which converts gases like methane into CO2-equivalent values based on their warming impact over a century.
However, experts argue that this approach oversimplifies the behaviour of different gases. Carbon dioxide remains in the atmosphere for centuries, while methane is far more potent in the short term but breaks down in about 12 years. By averaging methane’s impact over 100 years, its immediate warming effect is diluted, potentially underestimating the benefits of cutting methane emissions today.
The new RFA framework seeks to address this limitation by focusing on “radiative forcing”—a measure of how gases alter the Earth’s energy balance. Unlike the static GWP100 method, RFA is dynamic, taking into account how strongly a gas traps heat and how long it remains in the atmosphere. This allows for a more time-sensitive understanding of climate impacts.
Researchers say this difference is crucial. Reducing methane emissions now can deliver faster climate benefits compared to many long-term strategies. Yet under current accounting rules, such reductions may appear less valuable, affecting how carbon credits are assigned and which projects receive funding.
The study estimates that methane mitigation projects could be undervalued by as much as 36 to 40 percent under existing systems. This has direct consequences for carbon markets, where financial incentives are tied to the calculated climate benefits of emissions reductions.
The research draws on real-world projects developed under the Kyoto Protocol, including landfill gas capture, waste management initiatives, and agricultural methane reduction efforts in countries such as India, Brazil, and China. These projects demonstrate how current accounting methods may fail to fully recognise their climate impact.
Authors of the study, including experts from the Institute for Governance and Sustainable Development and Cornell University, argue that updating emissions accounting is essential for aligning climate policy with scientific reality. They emphasise that different greenhouse gases vary not only in their intensity but also in their lifespan, and that these differences should be reflected in how emissions are measured.
The findings come at a time when global efforts to combat climate change are intensifying, and accurate measurement tools are becoming increasingly important. Policymakers rely on these metrics to design climate strategies, allocate funding, and track progress toward international targets.
If adopted, the RFA framework could reshape how climate action is prioritised, potentially directing more resources toward projects that deliver rapid reductions in warming. Experts say such changes could accelerate near-term climate benefits, which are critical in the fight against rising global temperatures.
While further validation is needed before widespread adoption, the study has sparked fresh debate over whether the world’s current approach to measuring global warming is fit for purpose in an era of escalating climate urgency.