ClimateWire: Minnesota’s Republican governor used to make soaring speeches about defusing climate change. Now he’s making jokes, and some environmentalists are wondering whether his gone-missing support amounts to "bait and switch" politics. Gov. Tim Pawlenty is stoking frustration among Democratic state lawmakers and prominent climate thinkers for becoming "totally silent" on two major efforts to stem greenhouse gas emissions in Minnesota and in a strip of states stretching from Canada to …