This article surprises me.  I read once that the definition of overpopulation is when a nation's natural resources are depleted faster than they can be replenished, and that by that definition every nation on earth is overpopulated.  Food shortages are forecast because of it.  It seems that most or all of our current problems have overpopulation at the root.  I always think that a decrease in the population is our only hope for a reasonable quality of life here on earth.