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The supply of sand is also finite, but we aren't likely to run out any time soon.

Just because the supply is finite, doesn't automatically mean we will exhaust it.

Actually, as stupid as it sounds, we do start to run out of sand to make concrete in some areas.

A quick search about "sand shortage" will show you.

True, but I would guess that oil is used at a much higher rate than sand, especially considering the relative availability of each.

The question is whether we will use it all up before renewables become cheaper though.