[Porsche-O-Phile]

I suspect that the human race will destroy itself within about 300 years. Maybe sooner. The "humanity" that survives will be a much smaller population.

Too many people stretching the planet's resources too thin is one problem. The more immediate one (and the one that I think will destroy humanity in its current form) is that we have incredible technological innovations (most of which are designed for killing other people or destroying things) with very little respect or responsibility towards it.

There are way too many nuclear, chemical and biological weapons in the world. Eventually enough will fall into the hands of people with little or no restraint or discipline for these technologies and open warfare on an unprecedented scale will result, wiping out most of the world's population.

Xenophobia, territorialism, nationalism and religion. One or more of these will ultimately destroy us through providing some nutcase with a "reason" to initiate a nuclear, chemical or biological war.

I hate to say it, but I really don't think humankind has the collective discipline to set aside these differences and avoid meaningless self-destruction. Even if we do, eventually the other problems associated with overpopulation (food, water, air resources, etc.) will become limiting and possibly result in a mass kill-off of the population.