See Candidate Page Pete Buttigieg, Climate Climate tweets on Buttigieg 6/27/19 "The old ways are no longer relevant," said Bernie Sanders. "This is a global issue. What the U.S. president should do is not deny the reality of climate change." Here's what else @BernieSanders said: #DemDebate2 #DemDebate pic.twitter.com/Uff5aowbvr— grist (@grist) June 28, 2019