Andrew C. Revkin recent post on Dot Earth: Earth 2050: Population Unknowable? Basically he says research is showing the we are on a collision course with the price of oil and the carrying capacity of the earth. Some scientists say we will top out at 9 billion. Others say that that we can't even go that high. Still others say that we are like Wile E. Coyote. We have already run off the edge of the cliff and simply don't know it yet.... "Beep Beep"