First off, there never was a scientific consensus that there was going to be global cooling. There was a Newsweek article on it in 1975, but you'd have to really stretch to claim that a scientific consensus was warning of global cooling. At the time the two major competing mechanisms going on was cooling due to atmospheric aerosols, and warming due to greenhouse gases. You also have to keep in mind that in the 1970s the aerosol issue was dramatically addressed by banning CFC aerosols, which dramatically reduced the aerosols in the atmosphere (and thus, dramatically reducing their cooling potential), so we're left with greenhouse gases dominating. It isn't "they keep changing their story," it is that one of the issues was successfully addressed. Now, it would be nice if the other issue could be addressed.
You can see what the guy who wrote that Newsweek article has to say about it in retrospect.
HOLY MACRO!