Conservatism is about preserving a historical social order, rather than existing conditions generally. Acknowledging an environmental change and altering the structure of the economy to prevent it threatens the social order that allows oil companies, chemical companies, and auto manufacturers to be some of the wealthiest and politically powerful entities in the world.

Further, in the short term, ignoring climate change preserves the status quo for the wealthy and powerful. In the long term, though, it only really becomes an existential threat to those who are not positioned to profit from it -- look at Nestle attempting to take control of water supplies for an early example of what this might look like. Cataclysm is a life-and-death issue for the masses. For the powerful, it's an opportunity.