It's a million times more complex than a simple "DO YOU BELIVE IT YES/NO?"
I think most conservatives believe that humans are having some effect on the environment and the temperature is going up, ever so slightly. What they don't believe is that just because something is happening, it's automatically a problem, nor do they automatically believe every tom, dick, and sally that comes along saying they only way to save the world from global warming is to give them 10 million dollars.
As far as me personally, I think the solutions are mostly barking up the wrong tree. It's a really fucking simple math problem: X people cause Y pollution each, every Z of which results in a worse environment. There are two variables, but liberals love to pretend there is only one: we must use less, recycle more, blah blah blah. The truth is, there are too many people on this planet. China has 4 times our population: the problem isn't that americans use 50% more resources each, the problem is that China has too many damn people. There is a real hard limit to the number of people who can be supported on this planet, China & India are the clear problem in that regard.
But... the liberal solution has to be politically correct, has to be defensible, has to be nice, has to be popular- so the idea of telling people to quit having so many kids hasn't caught on, and probably never will. The planet is doomed.