Comment by makerofspoons

Please note that IPCC projections do not include carbon from permafrost in their projections: https://www.yaleclimateconnections.org/2018/02/the-permafros...

As a result, the carbon budget for keeping warming under two degrees over postindustrial (widely thought to be catastrophic but survivable) has shrunk. Dr. Peter Carter, one of the IPCC's reviewers, explains how we are likely to miss 1.5 and 2 degree targets: https://www.youtube.com/watch?v=oa13KrOvE2s