[andrew.v.spencer]

"How long can the world's natural resources sustain 10 billion people? The oceans will be fished clean. The soil will be farmed dry. The rivers' water will be exhausted. The earth's mineral wealth will be stripped." Sarakoth.

That's a fairly Malthusian response that assumes technology will not advance in the next one hundred years.

As for natural resources (in the next 100 years), well power is not a problem, metal is not a problem, gas is not a problem, coal is not a problem. Known reserves (without new discovery, or better tech is estimated in hundreds of years). Oil will probably be a problem.

Fresh water: unfortunately fresh water will probably be a problem for poor countries. For industrialised countries you might need desalination plants.

I think the problem is more likely to come from the macro increase in human consumption of resoruces and power, and the consequent
pollution issues.

But then the question is "what do you hope for" not "what do you fear will happen"