That's not entirely true (about global civilization being needed). Any nominally developped but not too wasteful country or even just California could do it. It

That's not entirely true (about global civilization being needed). Any nominally developped but not too wasteful country or even just California could do it. It's just that that ship has sailed and we collectively decided a long time ago NOT to go that way. Recovering from these choices would take a lot of time and a lot of money that we would rather spend on railroads to and from nowhere (California). Sarcasm aside, americans, europeans, japan in particular are not ready to pay the price for that - even while they could totally afford it. They are busy paying the price for lots of other things and can't be bothered.