I don't think the Earth is going to literally run out of anything, sure. We can always dig deeper, or prospect for more resources out in Siberia, or whatever. B

I don't think the Earth is going to literally run out of anything, sure. We can always dig deeper, or prospect for more resources out in Siberia, or whatever. But there's something to be said for being concerned about being responsible with this golden age we find ourselves in, when resources are so extraordinarily cheap and abundant. It's not a given that it will be like this forever. Imagine lithium being as rare as gold, and think about whether something like the phenomenon of ubiquitous smartphones would even have been possible.