Orson Scott Card has published a wonderful, wonderful article in Meridian Magazine concerning the provable falsehood of the so-called "hockey stick."
It's light years beyond a "must read". Send it to all of your progressive friends who believe in this UN-sponsored scam. Just don't ask them why Greenland is called Greenland - that might make their heads explode.
Meridian Magazine: All in a Good Cause (hat tip: Noel Sheppard)