Al Jazeera: When California Gov. Jerry Brown caught wind of the fact that top-tier GOP presidential candidate Ben Carson questioned the science behind climate change on a recent campaign swing through San Francisco, it seemed that Brown, a Democrat, could not help responding.
His office shot off a note to Carson, along with a flash drive containing a 167-page United Nations report written by more than 800 scientists and surveying 30,000 scientific papers definitively concluding that human activity has exacerbated...