"Whatever your thoughts on the relative human and natural influences on climate change, ignoring our military is not prudent. They understand the dangers of not being prepared."
Does Our Military Know Something We Don't About Global Warming? - Forbes
This is from Forbes (not hardly a Liberal rag) quoting the US Military (not remotely liberal).
The article focuses more on the security risks that global warming will create, rather then the environmental impact itself, and it also does a good job of explaining why the deniers are so effective in thwarting a rational discussion.