This post is part of the preliminary results of the NoL Foreign Policy Survey 2017 Pilot. I will be posting results throughout the week as I play around with the data. As always, I strongly emphasize that this is a pilot survey and these are just preliminary results.
Are libertarians climate change deniers? No. The majority agree that it is occurring, caused by human activity, and that it is harmful. They do not however support unilateral action by the United States government. At least not the average libertarian respondent.

Note that the last question, asking about supporting unilateral action, is on a different scale from the other three.
When you drill down by type of libertarian though you start to see stark differences. Left-libertarians agree much more strongly that climate change is occurring, caused by human activity, and harmful. They are also much more in support of unilateral action to prevent climate change.

What is driving the differences between type of libertarian? Part of the story seems to be that those who think climate change is harmful are more willing to act to address it, but I suspect a large part of the story is also that some libertarians, particularly market anarchists, simply do not trust the government. Market anarchists are less likely to believe climate change is harmful or caused by humans compared to libertarians at large, but the big difference in opinion is whether the government should act on it.
Thoughts? Tomorrow I will be posting the demographics of those who took the survey.

Update: Updated graphs; minor coding error.