The October 2018 IPCC Special Report (SR15) increased the Global Carbon Budget for a 66% of keeping global temperature increases below the dangerous 1.5 degrees. As a result, we have modified and simplified our charts. The revised carbon budget is 420,000 Mt CO2. Many calculations and charts are still based on the 2014 IPCC report and are biased towards per-capita sharing. (We are working on updating this.)
Limits on Cumulative Emissions
There is a limit to the cumulative emissions that the atmosphere can accomodate. The Intergovernmental Panel on Climate Change (IPCC) reports document these limits for different probabilities of global temperature increases.