Note: Analysis assumes efficiencies of 42% for supercritical coal and 59% for natural gas CCGT, for power plants installed in China in 2020 based on IEA (2013c), and methane leakage of 0.0045 kg CO2e per MMBtu of coal produced, based on U.S. data (U.S. EPA 2014), for lack of better global estimates. We use a [...]