World Meteorological Organization Report

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Context: A Greenhouse Gas Bulletin report from the World Meteorological Organization (WMO) said the increase in CO2 from 2019 to 2020 was slightly lower than that observed from 2018 to 2019 but higher than the average annual growth rate over the last decade.

CO2 emissions

This is despite the approximately 5.6% drop in fossil fuel CO2 emissions in 2020 due to restrictions related to the pandemic.

Methane emissions

The increase from 2019 to 2020 was higher than that observed from 2018 to 2019 and also higher than the average annual growth rate over the last decade.

Nitrous oxides

The increase was higher and also than the average annual growth rate over the past 10 years.

Annual Greenhouse Gas Index

The National Oceanic and Atmospheric Administration (NOAA) Annual Greenhouse Gas Index (AGGI) shows that from 1990 to 2020, radiative forcing by long-lived greenhouse gases (LLGHGs) increased by 47%, with CO2 accounting for about 80% of this increase.
Concentration of carbon dioxide (CO2), the most significant greenhouse gas, reached 413.2 parts per million in 2020 and is 149% of the pre-industrial level. Methane (CH4) is 262% and nitrous oxide (N2O) is 123% of the levels in 1,750 when human activities started disrupting earth’s natural equilibrium.
WMO report flagged concern that the ability of land ecosystems and oceans to act as ‘sinks’ may become less effective in future, thus reducing their ability to absorb CO2 and act as a buffer against larger temperature increase.
The Bulletin shows that from 1990 to 2020, radiative forcing — the warming effect on our climate — by long-lived greenhouse gases increased by 47%, with CO2 accounting for about 80% of this increase.
The numbers are based on monitoring by WMO’s Global Atmosphere Watch network.

https://www.thehindu.com/sci-tech/energy-and-environment/carbon-dioxide-emissions-in-2020-above-decadal-average/article37167104.ece