The problem I have with our politicians, especially the Republicans, is they're always claiming there's not enough proof, or that we're in a natural warming cycle. BULLSHIT. In addition to numerous studies, there are the things we can SEE WITH OUR OWN EYES, as in the article above.
The problem with this "let's wait until there's more proof" mentality is this - by the time there's absolute proof, it will be too late. It means we're already fucked.
HOW ABOUT SOME FUCKING PREVENTATIVE MEASURES YOU ASSHOLES? STOP CATERING TO COAL AND BIG OIL.
Let's also keep in the mind, my non-US friends, that while we're the worst offenders overall, we're not the only offenders. Russia is not far behind and China is working its way up.
Just sign the frickin Kyoto Protocol and deal with it.