The most important greenhouse gas, carbon dioxide (CO2), hit 413.2 parts per million last year, 149% of its preindustrial level. Right behind that was nitrous oxide (N2O), which hit 123% of the levels it held in 1750, when human activity first started disrupting Earth’s natural equilibrium, the WMO said. Then there was methane (CH4), 262% higher than preindustrial levels.
COVID-19 lockdown had ‘undetectable effect’ on greenhouse gas buildup, as warming emissions stoked temps: report
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