The US and EU are spearheading a global effort to slash emissions of methane – which account for more than 40% of global warming – by 30% between 2020 and 2030. Launched on the first Tuesday of COP26, 105 countries across the UN have now signed the pact, which alone could cut long-term temperature rise by 0.2°C. The success of this endeavor, however, will be defined by the countries that have not yet agreed to come onboard, and by whether it becomes legally binding, which at present it is not. In terms of climate change, each ton of methane is more than 100-times stronger as an atmospheric warming agent than a ton of CO2 when it is first emitted; it…