Global Letter – Climate change: let the numbers speak

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  Below1 are the key numbers2 relating to climate change, and some fundamental implications Definitions and facts Main greenhouse gases (GHGs): carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O).3 Global warming potential (GWP): differs by gas. Indicative relative values (ton for ton) are 1 (by definition) for CO2; 28-36 for methane; 265-298 for nitrous oxide.4 Carbon dioxide equivalent (CO2e): the GWP-weighted average of the various GHGs. Global CO2e emissions: 55 gigatons (gt) per year (2019).5 Global CO2 emissions: 33 gt per year (2019).6 Main emitte
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