The United in Science 2021 report

  • IASbaba
  • September 17, 2021
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The United in Science 2021 report

Part of: Prelims and GS II – International Relations and GS-III- Climate Change

Context The United in Science 2021 report is a multi-organization compilation of the latest climate science information and gives a unified assessment of the state of our Earth system.

Key findings

Context Organization  Key findings
Greenhouse Gas Concentrations in the Atmosphere World Meteorological Organization (WMO) Concentrations of the major greenhouse gases – carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2 O) 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 Agreement.

Global greenhouse gas emissions and budgets  Global Carbon Project Recent emissions trends of N2O, the third most important greenhouse gas after CO2 and CH4 , exceed the most greenhouse gases 
Emissions Gap  UN Environment Programme (UNEP) Five years after the adoption of the Paris Agreement, the emissions gap is as large as ever: global emissions need to be lower than current unconditional Nationally Determined Contributions. 
Global Climate in 2017-2021 and 2021-2025 WMO Annual global mean near-surface temperature is likely to be at least 1 °C warmer than pre-industrial levels
Highlights of the IPCC Sixth Assessment Report Human influence has warmed the atmosphere, ocean and land. Widespread and rapid changes in the atmosphere, ocean, cryosphere and biosphere have occurred.
Sea- level Rise and Coastal Impacts World Climate Research Programme – WMO, IOC, ISC Even if emissions are reduced to limit warming to well below 2 °C, global mean sea level would likely rise by 0.3–0.6 m by 2100, and could rise 0.3–3.1 m by 2300.


  • For the 2021 United Nations Climate Change Conference in Glasgow, known as COP26, to be a turning point, all countries must commit to net zero emissions by 2050, backed up by concrete long-term strategies, and enhanced Nationally Determined Contributions which collectively cut global emissions by 45% by 2030, compared to 2010 levels.

News source: TH 

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