The questions I love to ask my liberal students:
What human activity caused the 14th century to be warmer than today?
Why was the warmest year in the last 100 1938?
Why do satellites concisely show that no warming has occured?
Why is Mars getting warmer?
When I ask the same sort of questions to liberals, here are the answers that I get:
What human activity caused the 14th century to be warmer than today? A:That was just a local event, not a global one.
Why was the warmest year in the last 100 1938? A:It wasn't. The New York Times says 2011 is on course to be the warmest EVER!
Why do satellites concisely show that no warming has occurred? A:They don't. I can't ever get them beyond repeating themselves on this one.
Why is Mars getting warmer? A:It isn't! See above.
I'd like to hear what sort of answers you're getting since I have no intention of giving up on this fight.