It really has little to do with climate, and everything to do with control. The folks who say that human behavior is destroying the climate of the earth by making it hotter, or colder, are really interested in getting more control over our lives. They really believe that we are too dumb to just live our lives as we choose, and that only they, the enlightened elite are smart enough to make decisions for all of us. So they need a crisis looming, any crisis, to try to get the rest of us to agree to let them take over our lives and our decisions. And of course, the environmental elitists themselves see no hypocrisy in them jetting all around the earth or living in 15,000 square foot homes with air conditioning and heating, etc, etc, since they see themselves as more deserving than regular folks who are just ignorant yahoos.
I'll bet that few if any of the global warming fanatics support the 2nd Amendment. Again, it has nothing to do with climate, or even guns. It is a mindset that people are seen as responsible who have the right to live their own lives free from unnecessary government control versus those who see people as dumb and misguided who need the government to rule them and tell them how to live (and dumb folks of course are not to be trusted with guns in their hands). This is why using support of the 2nd Amendment is a great litmus test for politicians, to tell who trusts "the people" and who feels that "the people" need to be ruled.