That was also the problem: I've done it before.
Some of you won't remember, but in the seventies the world was supposed to end any second. We needed to stop all pollution because the emissions (now called greenhouse gasses) were bringing on an Ice Age. The same math which today shows that there must be alien life was used to prove that nuclear war was mathematically inevitable by 1995. There was absolutely no chance that there would be any oil left by 2000 and unless we could achieve ZPG (Zero Population Growth) immediately, mass famine would destroy civilization. All of that without even bringing into the equation the inevitable economic collapse promised by euro-dollars and the lack of any standard (gold or silver) for currency. Oh, and "stagflation" with both unemployment and inflation in double digits.