Just wondering, most of our present consumption is reliant on finite resources, especially oil. When oil gets scarce, can we switch consumption to other resources, or will we have to radically change our lifestyles or die off or something?

Well probably all 3 of the things you listed at the end there, not just oil but water, good soil, natural gas , coal, metals etc.... all things that take alot of time to replenish them selves. So we will have to radically alter our lifestyles, whether we like it or not, we can either choose to do it slowly or forced to do it by 'nature'. And a reduction in global population is not that unlikely considering the range of problems our world is facing at the moment and in the near future.

Go to space or reduction in population. Those two things will fix all of our consumption problems.

"Can the planet sustain us?"

Yes. But if we don't wisen up the majority of humans will be destroyed.

By "us" you mean totse. Otherwise there's too many people

Oil isn't the only way to produce energy. Hell, geothermal energy can sustain the earth for thousands of years and there's a whole lot of it, as well as the sea.

If we spent money on exploring space and harnessing all those resources other than invading little countries, the world would actually be an awesome place to be.