Read this article.
Then ask yourself a few questions:
1. How do they know what the temperature was 400 years ago?
2. With relatively little good climate data before 1890, how can anybody make these assertions with a straight face?
3. Why are these people lying to us?
4. Why is the media hyping this insanity, and reporting it as fact when there is more data contradicting global warming that there is that proves it?
Then: engage the debate with the shrub-cuddlers. Get informed, then start arguing with them. They won't listen to you, and hysterically claim all your research is biased because its driven by the terrible capitalists who are bent on polluting the entire planet, clubbing baby seals to death, eating babies, and voting Republican. YOUR agenda is evil, while THEIRS is motivated because they're such caring stewards of mother earth, who don't believe in deodorant or women shaving their legs.
Finally, read Michael Crichton's STATE OF FEAR. Show 'em you aren't afraid of the truth, and are willing to pay money to support people who are speaking out against this lunacy.