Surely a maximum safe level with a reasonable probability of safety in avoiding critical tipping points is not unreasonable, and indeed vital for policymakers? (realclimate.org)
Human societies must now change course and steer away from critical tipping points in the Earth system that might lead to rapid and irreversible change (3). (science.sciencemag.org)
I think we've already passed critical tipping points, so the only way to keep temps below the two degree target will be with geoengineering. (realclimate.org)