Pollution was probably another contributing factor; I’d be surprised if it wasn’t a lot worse in the 60s than it is now: a lot of environmental controls got put in place in the intervening decades. Remember, there was leaded gasoline everywhere, and acid rain scares and the ozone layer depletion in the 80s.
Pollution was probably another contributing factor; I’d be surprised if it wasn’t a lot worse in the 60s than it is now: a lot of environmental controls got put in place in the intervening decades. Remember, there was leaded gasoline everywhere, and acid rain scares and the ozone layer depletion in the 80s.