United in Science 2021: A Timely Reminder on World Climate

On 16th September, 2021, the World Meteorological Organization (WMO) released the third edition of a report titled, ‘United in Science 2021’. It is a multi-organization high-level compilation of the latest climate science information.

Key Messages

Greenhouse Gases

  • Overall emissions reductions in 2020 likely reduced the annual increase of the atmospheric concentrations of long-lived greenhouse gases, but this effect was too small to be distinguished from natural variability.
  • Major greenhouse gases like CO2, CH4, and N2O continued to increase in 2020 and the first half of 2021.
  • Reducing atmospheric methane (CH4) in the short term could support the achievement of the Paris ....
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