Non-CO2 greenhouse gases (GHGs) such as methane (CH4) and nitrous oxide (N2O) play a critical role in global warming despite being less abundant than carbon dioxide (CO2). Methane has a global warming potential approximately 28-36 times greater than CO2 over 100 years, while nitrous oxide is about 265-298 times more potent. These gases arise from various sources: CH4 mainly from agriculture (enteric fermentation, manure management), landfills, and fossil fuel extraction; N2O primarily from agricultural soil management, fertilizer use, and industrial processes. In greenhouse gas inventories, accurately quantifying CH4 and N2O emissions is essential because they significantly contribute to the total radiative forcing driving climate change. Their shorter atmospheric lifetimes compared to CO2 mean that reducing these emissions can yield faster climate benefits. Inventories that include non-CO2 gases provide a comprehensive understanding of emission sources and help prioritize mitigation efforts. Addressing CH4 and N2O is crucial for effective climate policy, enabling targeted strategies beyond CO2 reduction and supporting international commitments like the Paris Agreement.

Published on: 2026-01-31 at 00:15:02