Dwelling further on yesterday's ideas, another way to look at it is that man might solve these problems through some disruptive technologies.
For example, water-hydrogen/solar powered cars, heating, etc. will make energy from an infinite source. If we believe that most sci-fi is really not fiction but reality ahead of its time - then Asimov's ideas of mineral recoonstruction - from iron ore to gold, etc will make commodities infinitely more available... and existing technologies like reverse osmosis might become cheaper to make water more available...
Hmm... wonder which way things will go forward...
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