A new study by researchers at ETH Zurich argues that methane emissions require specific reduction targets independent of carbon dioxide mitigation strategies to effectively limit global warming. The research, published in Communications Earth & Environment, contends that treating methane and CO2 as interchangeable through CO2-equivalent metrics obscures the urgency of methane reduction given its potent warming potential and relatively short atmospheric lifespan.
The authors demonstrate that combining methane and other greenhouse gases into a single metric creates methodological challenges. Different conversion approaches yield different conclusions about methane’s priority level depending on the time horizon and baseline assumptions used. This flexibility in calculation allows climate models to underrepresent methane’s importance in mitigation strategies. The researchers propose an alternative framework: establishing a global warming limit first, then determining the minimum methane reductions necessary to achieve that target alongside existing net-zero CO2 goals.
The study’s analysis shows that under current policy trajectories, methane emissions are expected to rise approximately 20 percent by 2050 relative to 2020 levels. This scenario would result in peak warming exceeding 2C even if CO2 reaches net-zero by mid-century. To limit peak warming to 1.7C under a 2050 net-zero CO2 target, methane emissions would need to decline by at least 69 percent by 2050. If net-zero targets cover all greenhouse gases rather than just CO2, the required methane reduction decreases to 63 percent.
Currently, only a handful of countries including Japan, Mexico, and South Korea have established explicit methane reduction targets. The research indicates that meeting a one-third reduction in methane emissions—consistent with the Global Methane Pledge target for 2030—could reduce peak warming by 0.15C. The authors conclude that decoupling methane and CO2 reduction strategies and setting specific methane targets is essential for achieving climate goals aligned with the Paris Agreement’s objectives.
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