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T1 United in Science 2021: A Multi-organization High-level Compilation of the Latest Climate Science Information
A1 World Meteorological Organization, 
A1 United Nations Secretary-General, 
A2 Andrew, Robbie
A2 Baddour, Omar
A2 Bissolli, Peter
A2 Campbell-Lendrum, Diarmid
A2 Canadell, Josep
A2 Christensen, John
A2 Ciais, Philippe
A2 Davidson, Eric
A2 Davis, Steven
A2 Devillier, Rose
A2 Friedlingstein, Pierre
A2 Goto, Atsushi
A2 Grimes, Sarah
A2 Hermanson, Leon
A2 Honoré, Cyrille
A2 Jackson, Robert B.
A2 Kappelle, Maarten
A2 Kennedy, John
A2 Le Quere, Corinne
A2 Liu, Jian
A2 Liu, Zhu
A2 Loh, Zoe
A2 Luterbacher, Jürg
A2 Masson-Delmotte, Valérie
A2 Nicholls, Robert J.
A2 Olhoff, Anne
A2 Paterson, Laura
A2 Peters, Glen
A2 Rogelj, Joeri
A2 Rösner, Stephan
A2 Scaife, Adam
A2 Smith, Doug
A2 Solazzo, Kate
A2 Sparrow, Michael
A2 Stefanski, Robert
A2 Tarasova, Oksana
A2 Thompson, Rona
A2 Tian, Hanqin
A2 Vermeulen, Alex
A2 von Borries, Rosa
K1 climate change
K1 greenhouse gas
K1 heat
K1 wildfire
K1 environmental financing
K1 budget
YR 2021
FD 2021
LK https://wedocs.unep.org/handle/20.500.11822/38421
UL https://wedocs.unep.org/handle/20.500.11822/38421
NO This report provides a holistic assessment of recent climate science by synthesising data from several global partner organisations. The document examines atmospheric greenhouse gas concentrations, global emission budgets, and observed climate trends between 2017 and 2021. Utilising observational networks and climate modelling, the text establishes that human influence has unequivocally warmed the atmosphere, ocean, and land, leading to unprecedented changes across the biosphere. Key findings indicate that concentrations of major greenhouse gases reached new record highs in 2021, while global surface temperatures remained among the warmest on record. Furthermore, the analysis highlights an accelerating rise in sea levels and an increasing frequency of extreme weather events, such as devastating heatwaves and floods. The scope also encompasses future projections, revealing a significant gap between current national commitments and the emission reductions required to meet international temperature goals.
DS UN Environment Document Repository
RD Sep 16, 2026