Peak methane on the horizon; IPCC in synthesis mode

The release of the 2023 version of the Global Methane Tracker by the International Energy Agency (IEA) last week once again highlighted how carbon dioxide (CO2) emissions are far from the only challenge on the climate front. Based on “global warming potentials” over a 100-year time horizon (which is the typical way of comparing different greenhouse gases), methane accounts for about one sixth of global greenhouse gas emissions each year, compared to about 75% for CO2. (So-called F-gases including chlorofluorocarbons (CFCs) and hydrofluorocarbons (HFCs) account for the rest.)