Missoulian: Controversy is essential in a functioning democracy. You may be in favor (or against) background checks for gun purchases in Missoula or have a strong opinion on the school bond issue. The reality TV that fronts as our primary presidential debates sparks lively conversations around the social media water cooler. Climate change dialogue, however, is different. The discourse should be around policy, and not about whether climate change is happening or not. We have somehow digressed, responding to...