Achieving the Paris Agreement's temperature goals requires cutting global CO2 emissions 25 to 50 percent this decade, followed by a rapid transition to net zero emissions. The world is currently not yet on track so there is an urgent need to narrow gaps in climate mitigation ambition and policy....

Countries are increasingly committing to midcentury 'net-zero' emissions targets under the Paris Agreement, but limiting global warming to 1.5 to 2 degree C requires cutting emissions by a quarter to a half in this decade. Making sufficient progress to stabilizing the climate therefore requires...