UNBELIEVABLE - LITERALLY!
Some things to consider:
Climate change has been around as long as the earth: If you listen to global warming alarmists, you'd think the climate had been a flat line until mankind started industrializing, after which the temperature rocketed straight upwards.
The earth was cooling from roughly 1940-1976: Despite the fact that widespread industrialization was occurring during that 30 year time period, temperatures dropped so much that there were claims we were going into a dangerous period of "global cooling."
So, if it's global warming, why isn't there any warming occurring now? One of the many revelations from Climategate is that behind-the-scenes, scientists who buy into man-made global warming are admitting what skeptics have been saying publicly for years now: The globe has been cooling since 1998.
Climate models can't accurately project the weather 100 years in the future: The truth is that we don't fully understand how our planet's climate works and thus, our climate models don't work very well. Since the climate models can't explain the climate over the last 25 years and they can't explain the leveling off of temperature since 1998, why would anyone believe they can predict conditions in 100 years? As computer programmers say, "garbage in, garbage out."