DENVER (AP) — Brian Bagley isn't the first person that comes to mind when you picture a wind or solar advocate. The 40-something Longmont mayor has a concealed carry permit and wears cowboy boots. Four antique shotguns hang on the walls of his law practice. He's a former registered Republican, but switched to independent for the 2016 election.

Yet, in December, Bagley issued a mayoral proclamation for his city to pursue a 100 percent renewable energy source by 2030.

"I'm getting a lot of hits from the far right, saying 'Oh, Bagley, you caved to the left. You tree hugger, you.' What they don't...