The data I have seen is not ambiguous--it is getting warmer. I've seen some serious arguments by well regarded folks on both end of the spectrum politically, and they loudly disagree about causes and what to do next--but they essentially all agree it is getting warmer.
I for one don't like the "I could get struck by falling space junk tomorrow, so why worry" point of view for myself. I've seen the Chernobyl data, Love Canal, Japanese mercury, and the Aral Sea info. To say we don't affect the earth's habitability is beyond stupid. I have no desire to revert to a hunter-gatherer society with a life expectancy in the 30s, but I also prefer to avoid the deforestated earth as well. As always (except on here) moderation is a good thing.
Originally Posted by Old-T
Even if we have proof that the Earth is warming, that's not the same thing as proof that humans are causing it. It's also not proof that the warming will continue. There is a tendancy to take a change in temperature over a period of time and project future temperatures based on "if the current trend continues." That's the tactic that junk scientists were using in the seventies when they warned that we were headed into an ice age.
Dramatically cutting back on carbon dioxide and methane emissions will produce an uncertain, very likely negligible, benefit. The effect it will have on our economy is much more certain; it will be devastating.