More chilling information here.
At cocktail receptions at scientific dinners, I have pulled the pro-GW people aside and asked the question, "which would be worse for humanity, global warming or global cooling?" Almost most all will answer, "global cooling" but they will hasten to add, "but there is no chance of cooling."
I agree: Warmer temperatures worldwide since the 1970's, along with the Green Revolution, have allowed adequate food to be grown for the growing world population. If we cool significantly (with shorter growing seasons), all bets are off.