Indeed, they had to know they were pulling a scam. One of the first questions I ask libs who try to debate the issue is, what temperature is the earth supposed to be? How do they know this? Do they expect that temperature to never change? By that point they shut up, throw a fit or swear at me...you know, the typical liberal response when they are proved wrong.
http://www.lomborg.com/cool_it/?PHPSESSID=21d6774463f867b109bbb457c2709907
How dare you debate it.
After all, we are talking about the survival of humanity. You saw the Day After Tomorrow and Al Gores Inconvenient Truth, didn't you? That could happen!
.... sarc