I think the reason why many of them deny climate change is because they have an antipathy toward making a better planet for future generations. The reason for this is tied to radical Christianity radical beliefs of other religions.

The very idea of making human life sustainable on Earth goes against the grain of one of their core beliefs -- that life is a period of tribulation for us to endure before we die and hopefully go to heaven. They don't want people to live happily and peacefully on Earth, really. They want life to be hard and full of sorrow so that people will long for the release of death and the pleasures of heaven and being with God. If people start trying to make life better on Earth, they'll want to stay here, and they'll be putting their efforts into trying to make this world better instead of trying to please God so they'll have a pleasant afterlife. Seen in that light, our attempts to make a better world are a direct threat to the survival of their religions

Humanism and environmental consciousness are a threat to religions that emphasize sin and damnation and rules to be followed in order to have a happy afterlife. They essentially do not want life on this planet to be a peaceful, fulfilling, and enlightening experience. They shun peace negotiations with other countries and they despise breakthroughs in medicine that allow people to live without the consequences of their sins. Essentially, they loathe any sort of progress toward making Earth a good place to live. The next time you hear one of those people from a RW think tank ridicule climate change, ask yourself where that bitterness is coming from.