What Does the New IPCC Report Say About Climate Change? (Part 2)

guest post by Steve Easterbrook

(2) Humans caused the majority of it

The summary for policymakers says:

It is extremely likely that human influence has been the dominant cause of the observed warming since the mid-20th century.

(Box 13.1 fig 1) The Earth’s energy budget from 1970 to 2011. Cumulative energy flux (in zettaJoules!) into the Earth system from well-mixed and short-lived greenhouse gases, solar forcing, changes in tropospheric aerosol forcing, volcanic forcing and surface albedo, (rela...