Pmaust -
What I hope you will notice is how specific the rebuttals and debunking of such claims are. You should note how unspecific and vague the rebuttals against the IPCC are.
Within 5 minutes, I could find a counter to every claim made by these denialists. There's good reason it's not so easy to do this with the work done by the IPCC.
Read it for yourself. Study, learn, ask... don't be led like a sheep by spinsters. Also, don't just stick with the executive summaries. Drill down into the parts that interest you. If you question something, look at the reference and explore that. It's a lot of work, yes, but it's worth it to find your own truth.
IPCC Fourth Assessment Report: Working Group I Report "The Physical Science Basis"
