A new study published in Communications Earth & Environment examines the relationship between methane emissions reductions and global temperature limits, arguing that climate strategies should treat methane and CO2 reductions as separate rather than combining them into a single metric.
Methane is the second-largest contributor to global warming after carbon dioxide, but differs significantly in its atmospheric properties. While methane traps heat more efficiently than CO2, it persists in the atmosphere for only a few decades compared to centuries for CO2. The research contends that existing climate models often obscure methane’s distinct role by converting all greenhouse gases into CO2-equivalent measurements, an approach that can make methane reduction appear either urgent or unnecessary depending on underlying assumptions and time horizons chosen.
The researchers analyzed various scenarios combining methane and CO2 emissions pathways beginning in 2025. They found that achieving peak warming of 1.7C under a 2050 net-zero CO2 scenario would require methane emissions to decline by at least 69% by 2050 relative to 2020 levels. For organizations with net-zero targets covering all greenhouse gases, a 63% methane reduction would be necessary. However, current policies are projected to increase methane emissions by approximately 20% by 2050, which would result in peak warming exceeding 2C even if CO2 reached net-zero by that date.
The study highlights that implementing the Global Methane Pledge target for 2030, which aims for one-third methane reductions, could decrease peak warming by 0.15C. Only a handful of countries—including Japan, Mexico, and South Korea—currently specify separate methane mitigation targets. The researchers recommend that states and organizations establish peak warming limits first, then determine minimum compatible methane reduction targets based on their existing net-zero commitments, rather than relying on conversion formulas that may obscure methane’s distinctive climate impact.
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