A Gift to the Skeptics

The leaked U.S. Special Report on climate has been touted as a slam-dunk against Donald Trump but it is, in fact, a gift to the skeptics.  It foregrounds the "frequency and severity" of recent weather events—even though it was the IPCC that trained us not to confuse weather with climate.  It devotes a full chapter to scary Waterworld scenarios not predicted by current models but which "cannot be ruled out" (p. 608). And it offers this intriguing juxtaposition: "The relationship between cumulative CO2 emissions and global temperature response is estimated to be nearly linear" (p. 34), yet "almost no increase [in temperature] occurred from the mid 1940s to the mid 1970s, which is not well understood" (p. 43).