Introduction and framing

IPCC, 2022: Climate Change 2022: Mitigation of Climate Change. Contribution of Working Group III to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change, 2022
Grubb, Michael; Okereke, Chukwumerije; Arima, Jun; Bosetti, Valentina; Chen, Ying; Edmonds, James; Gupta, Shreekant; Köberle, Alexandre; Kverndokk, Snorre; Malik, Arunima; Sulistiawati, Linda Yanti

Global greenhouse gas (GHG) emissions continued to rise to 2019: the aggregate reductions implied by current Nationally Determined Contributions (NDCs) to 2030 would still make it impossible to limit warming to 1.5°C with no or limited overshoot, and would only be compatible with likely limiting warming below 2°C if followed by much steeper decline, hence limiting warming to either level implies accelerated mitigation actions at all scales (robust evidence, high agreement).