Nation Methane emissions soared to a record high in 2021 in an ‘alarming’ trend, NOAA says April 7, 2022Doyle Rice, USA TODAYComments Off on Methane emissions soared to a record high in 2021 in an ‘alarming’ trend, NOAA says For the second year in a row, scientists report a record increase in the level of methane in Earth's atmosphere. Carbon dioxide levels also surged.