The funny thing about science is that it's true:
1) regardless of who's saying it and whether or not they're a hypocrite OR a cynical politician simply looking to free ride off a position popular with their base
2) regardless of whether or not you choose to recognize it
Likewise, the statements "1+1=2" or "the sun has risen every day for the past five years" or "the climate is on an undeniably upward trend, as are CO2 concentrations in our atmosphere" are true whether or not they're said by Neil Armstrong, Joseph Stalin or Ayn Rand.
Impugning the global, essentially universal consensus of the scientific community, implying there's a worldwide conspiracy of "greedy scientists" out to wreck the global economy so--what, their green energy companies can be temporarily subsidized until they replace current industries?--is what we call a conspiracy theory.
The evidence for anthropogenic climate change is beyond question--the right's denial of science has ranged variously from "global warming is a hoax!1!shift+1!" to "It snowed this winter! So much for global warming!" or "Is global warming really such a bad thing? I sure want these cold winters to end!" In 2008, McCain and even Palin recognized it. Since the Tea Party entered the picture, the right has been tripping over itself, right off an unscientific cliff.