Global atmospheric concentration of methane has hit an all-time high — to 1,875 parts per billion (ppb) in 2019 from 1,866 ppb in 2018 — according to a new preliminary estimate released by the United States National Oceanographic and Atmospheric Administration (NOAA). Methane is a powerful greenhouse gas — its potential to cause global warming is over 25 times that of carbon dioxide. Not only is the 2019 figure the highest since record-keeping began in 1983, the increase during the year was the second-largest single-year leap in over two decades.
— source downtoearth.org.in | 16 Apr 2020