no asteroids or giant valcanoes?

In terms of evolutionary biology, most animal populations naturally have the capability to reproduce beyond the environments capacity to sustain them. So, unless there IS some great intervention, we will eventualy meet an end by the means of over population. And exponential population growth means overpopulation is creeping up faster than we think. And our resources are NOT being sustained, despite our feeble efforts. There are to many implications for this problem and not enough solutions.