Interesting website, Aussie.
But I'm still not quite convinced. First of all, the temperature change data it uses---keeping records from ancient trees, lakebeds, etc.---compares temperate changes within the last 2,000 years. That is basically nothing compared to the billions of years the earth has lasted. The Cretaceous Period alone, which was the last era of the dinosaurus, was over more than 65 million years ago.
The website does make refrence to us having the highest carbon levels in over 650,000 years. But once again, that is scarcely an eyeblink in Earth terms. For all we know, changes like this could be what caused the massive extinctions that happened periodically throughout earth's history.
That's not exactly a comforting thought either.
But that doesn't mean that people are causing this change.
I do think that we need to stop spewing pollutants into the air. Smog, acid rain...those are all definate results of air pollution. But I just don't think there's enough info available yet to blame global climate change on air pollution.