A friend of mine said that currently, the "wealthy" 1.5 billion people on earth consume as much as the poor other 4.5 billion. He also said there are not enough resources (corruption, etc, aside) to have the others live the "rich" life style. Which begs the question... how much human life can earth sustain? During the 20th century, the population went from something like 1.5 to 5 billion.... i think prognoses are 9 billion for 2050, but "only" 9.5 billion for 2150. Could overpopulation become an issue during our life times?