How can we talk about remaining carbon budgets when we have already passed 400 ppm, the CO2 concentration corresponding to 1.5 C warming? (skepticalscience.com)
And every day the world's remaining carbon budget gets smaller. (nationalobserver.com)
For example, analyses of remaining carbon budgets often use ESM - derived numbers from the Intergovernmental Panel on Climate Change's (IPCC) most recent assessment report, and calculate remaining budgets using observed cumulative emissions to date. (carbonbrief.org)