With all economic growth going on in our world today, and the accompanying depletion and pollution, do you think we'll see the collapse of the biosphere in our lifetime, and if not, when will it happen? In 20 years? 100 years? Or can we go on like this for, say, another 10000 years? And what will the impact be for those making a living as CFA charterholders for the next 40 years to come?