A new scientific study is raising serious questions about how the world measures global warming, warning that current methods may be underestimating the true impact of certain greenhouse gases and misguiding climate policy and carbon markets.
Published in the journal Environmental Research Letters the research introduces an alternative framework called Radiative Forcing-based Accounting (RFA), which aims to more accurately capture how different greenhouse gases affect Earth’s temperature over time. The study argues that the widely used system for measuring emissions based on carbon dioxide equivalents fails to reflect the real-time warming effects of gases like methane.
For decades, climate policy has relied on a standard unit known as carbon dioxide equivalent (CO₂e), which compares the warming impact of different gases using a metric called Global Warming Potential (GWP). Under this system, methane is assigned a fixed multiplier about 28 times more potent than carbon dioxide over a 100-year period. However, scientists now say this long-term averaging masks methane’s intense short-term impact.
Methane, unlike carbon dioxide, remains in the atmosphere for a much shorter duration around 12 years but traps significantly more heat during that time. The study highlights that by spreading methane’s impact across a century, current models dilute its immediate effects, potentially undervaluing efforts to reduce it.
The newly proposed RFA framework shifts away from this static model. Instead of assigning a single value, it tracks how each gas behaves over time, considering both its heat-trapping ability and atmospheric lifespan. This dynamic approach allows for a more precise understanding of when and how emissions reductions deliver climate benefits.
Researchers argue that timing is critical. Cutting methane emissions today can deliver rapid cooling benefits, while delays allow warming to occur before mitigation takes effect. By capturing this time-sensitive impact, RFA provides a more realistic picture of climate action outcomes.
The implications are significant for global carbon markets. These markets assign financial value to emission reductions, determining which projects receive funding. If methane reductions are undervalued under current systems, projects targeting these emissions may be underfunded despite offering faster climate benefits.
The study’s findings suggest that existing methods may underestimate methane mitigation efforts by as much as 36 to 40 percent. This gap could influence investment decisions, policy priorities, and the overall pace of climate action.
Researchers tested the framework using real-world projects under mechanisms linked to the Kyoto Protocol, including landfill gas capture and wastewater treatment initiatives in countries such as India, China, and Brazil. The results showed that many of these projects deliver greater climate benefits than currently recognised.
Experts behind the study, including members of the Institute for Governance and Sustainable Development and Cornell University, argue that updating climate accounting systems is essential for aligning policy with scientific reality.
They also point to recent assessments by the Intergovernmental Panel on Climate Change, which emphasise the importance of addressing short-lived climate pollutants like methane to slow near-term warming.
As countries intensify efforts to combat climate change, the study calls for a reassessment of how emissions are measured and valued. A shift toward more accurate accounting, researchers say, could unlock faster and more effective pathways to limit global temperature rise.