The vast majority of those who deny climate change are Americans... religious Americans.
Notably so in the Evangelical sects of the US.
The issue is how to deal with them, their careless treatment of the planet, it's resources, etc.
I've found the following logic to work on occasion.
I've summarised it into a "passage" for easier reading. It also makes more sense to the religious in this form... for some reason.
(I don't believe in god... but the only thing that makes sense to these people is god and what their imaginary friend may or may not want... so I had to use that angle.)
"Did god not make trees flammable?
The waters taintable?
Why then do you believe his largest and greatest creation of all was not created equally as fragile?
Your life is a test. And this planet, gods house and greatest creation, is a part of that test.
Hell itself cannot enforce the level of fury god will show you when he sees what YOU have willingly done to his house... while arrogantly claiming you've done nothing."
Of course, feel free to throw up a little upon reading the "god" parts... I threw up a little writing them... unfortunately, I can't effectively deliver the message to them with "Who doesn't exist" tacked on to every sentence.
... they tend to catch on to you being Atheist that way.