James Burke's documentary on climate change from 1989. I remember seeing this as a kid and having the shit scared from me. Burke's conceit, that he's communication from 2050 about 60 years of work to stem the affects of climate change, seems as quaint as a Ray Bradbury Mars story. Japan wins the climate wars (cause back in the 80's Japan was going to take over the WORLD) and the whole planet is under a Planetary Management Authority.
Though some creepy accuracy (like the US getting stuck in a series of Oil wars that cost it standing in the world, mind you this is pre-Gulf War I) in there as well. Carbon bargaining is cap and trade really. Debt canceling for the third world.
20 years on and climate change is still being "debated" by people with actual power and the science background of koala bears.