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three-main-greenhouse-gases-reached-record-highs-in-2021
three-main-greenhouse-gases-reached-record-highs-in-2021

Three main greenhouse gases reached ‘record highs’ in 2021

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Atmospheric levels of the three main greenhouse gases – carbon dioxide (CO2), methane and nitrous oxide – all reached new record highs in 2021, according to a new report from the World Meteorological Organisation (WMO).

WMO’s Greenhouse Gas Bulletin reported the biggest year-on-year jump in methane concentrations in 2021 since systematic measurements began nearly 40 years ago. The reason for this exceptional increase is not clear, but seems to be a result of both biological and human-induced processes.

The increase in carbon dioxide (CO2) levels from 2020 to 2021 was larger than the average annual growth rate over the last decade. Measurements from WMO’s Global Atmosphere Watch network stations show that these levels continues to rise in 2022 over the whole globe.

Atmospheric CO2 reached 149% of the pre-industrial level in 2021, primarily because of emissions from the combustion of fossil fuels and cement production. Global emissions have rebounded since the COVID-related lockdowns in 2020. Of the total emissions from human activities during the 2011–2020 period, about 48% accumulated in the atmosphere, 26% in the ocean and 29% on land.

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