50 sci­en­tists warn offi­cial pre­dic­tions don’t include a feed-back as large as all U.S. emis­sions: the warm­ing soil. From the Nether­lands, Dr. Thomas Crowther. From Maine, pale­o­bi­ol­o­gist Dr. Jacque­lyn Gill says abrupt cli­mate change hit species before us. We’re next.