Nothing will do more to slow the rate of near-term global warming than cutting an odorless, colorless greenhouse gas—not carbon dioxide but methane. In many cases, reductions are virtually cost-free, and will make it cheaper to deal with the expensive impacts of an unstable climate. …This week, at the climate summit in Glasgow, dozens of nations are joining and effort led by the U.S. and the European Union to cut methane pollution 30% by 2030. …Another bargain is to limit the burning of tropical forests, which accounts for 15% of global CO2 emissions. …This week saw a big step forward when the LEAF Coalition announced it has mobilized $1 billion for large-scale forest protection and sustainable development designed to benefit indigenous peoples and forest communities. …Another potential source of finance for tropical forest protection is the Carbon Offsetting and Reduction Scheme for International Aviation, endorsed by more than 190 countries. [the access the full story a WSJ subscription is required]