Research data collected at remote NOAA sampling locations indicated the global surface average for CO2 was 412.5 parts per million last year -- a 2.6 ppm increase. The global increase rate constituted the fifth-highest on record for a single year, after 1987, 1998, 2015 and 2016, according to NOAA. Atmospheric methane's annual increase for 2020 was 14.7 parts per billion, the largest in the 37 years NOAA has measured it.
(Source: NOAA Research News, Website PR, 7 Apr., 2021) Contact: NOAA, email@example.com
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