CO2 budgets published by the IPCC

Overarching goal in the Paris Agreement is to hold
"the increase in the global average temperature to well below 2°C above pre-industrial levels" and
pursue efforts "to limit the temperature increase to 1.5°C above pre-industrial levels."

Remaining global CO2 budgets from 2020 on according to the IPCC Sixth Assessment Report
for different global warming levels with a compliance probability of 83%:

Warming
Estimated remaining carbon budgets
[°C]
[GtCO2 from 2020 on]
1.5
300
1.6
400
1.7
550
1.8
650

We currently emit around 41 Gt per year.

We have summarised more detailed information here:

ipcc-co2-budgets.climate-calculator.info




The MCC's CO2 clock is based on a compliance probability of 67% (1.5°C 400 Gt, 2°C 1,150 Gt) and
asks asks how long the global budget would last if global emissions remained the same.

 

 

Web app for determining linear global reduction paths that comply with a predetermined CO2 budget:

global-paths.climate-calculator.info

 

Web app for calculating Paris-compatible national CO2 budgets:

short.national-budgets.climate-calculator.info

The web app takes the two decisive criteria into account:

(1) current reality

(2) climate justice

See the corresponding excursus here on the fundamental question of the criteria for allocating a global budget.