This whole "scientists used to think we were headed into an ice age" thing is one of those delicious examples of things I thought to be true that turn out to be wrong.

Over at RealClimate, William Connolley does a great job today of laying out a case he's been building for a long time. The bottom line is that, while there was some discussion in the scientific community in the 1970s of the possibility of a future ice age, the notion that scientists generally believed one was imminent, and now have changed their tune to say we should expect warming instead, is flat wrong.