wasn't it about 20 years ago that Carl Sagan was trying to ram "nuclear winter" down our throats?
Carl Sagan is and always has been an idiot.
A bit before that, Paul R. Ehrlich was pushing his book "The Population Bomb". His projection was that increases in population would result in mass starvation in the 70s and 80s. (Somehow, I missed it happening. I guess I just wasn't paying attention.)
His money quote:
"The battle to feed all of humanity is over. In the 1970s and 1980s hundreds of millions of people will starve to death in spite of any crash programs embarked upon now. At this late date nothing can prevent a substantial increase in the world death rate..."
From: Wiki Reference