Comment by dagw

I agree that population growth cannot go on forever (although I consider doubling the current number quite likely). However I see no reason why energy availability can't keep growing for many many centuries to come. We aren't tapping the full potential of nuclear fission, to say nothing about fusion. Things like solar energy in all its variations is also a source we basically aren't using at all. Give us 50-100 years an we'll no doubt come up with some new source of energy we haven't even considered yet.