system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Where are all these resources coming from to build cars and electronics and medical equipment? Are we running out? Are we seriously going to start mining other planets and asteroids for resources?
gpt
We're digging up the resources from underground.  We probably won't run out out of most things for a long time.  Some of the things we use could be recycled better.  Sometimes we don't recycle things because it's cheaper to dug up new stuff than try to recycle old stuff.  If we started running out of stuff to dig up, recycling would start to look better.  We'd probably recycle enough to not need to mine other planets or asteroids, but it's not inconceivable.  We might be running out of oil that's easy to reach.  We use oil to make plastics.  If we run out we'll have to make plastics a different way, figure out how to recycle plastic better, or use alternative materials.  It's unlikely that there is oil off earth, because oil is probably a  product of biological processes.