All these so called scientists just can't admit the earth has natural cycles of heating/cooling.
Guess it's more PC to blame it on those eeeeevil SUVs!
Actually I think it's two things:
1) They want government research money so that they can sit at their full salary, $100,000/year, ten hour per week, college teaching/research job, while having a bunch of non-English speaking grad students do their work for them because they are out acting like Ward Churchill, ripping the US a new one.
2) These people can't live without hating something. This is simply the next bandwagon to jump on for hating things/people.