it has less to do with chemicals than with poor soil conservation and use. add a drought and you have dust. i was told once that the small family farm was destroyed by the GI bill, which might be a little extreme, but makes the point the here and all over the world, we became a more educated and more industrialized people. why on earth would a kid stay on the farm and work 16 hours a day when he could go to a factory, work half the time and make twice the money. if you could get to college, you could make even more.
both Stalin and Mao killed many millions of people dragging them from the farms to the factories.
to the subject: periods of warming have historically been periods of great growth in innovation, arts, health, etc. periods of cold have been the opposite. if i got a vote, i'd vote for a little warming, not cooling. heck, we could get a whole new (to us) continent out of it!