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by randallsquared
5343 days ago
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we would drink up 2 205 000 000 000 litres of fresh water in a day, but the total possible water supply we can access (and this includes the glaciers) is only 3.5 × 10^19 litres... That's quite an easy way to run out of water. Water doesn't vanish after it's used. Also, putting your first number in scientific notation helps put this in perspective: 2.2 x 10^12 . Seven orders of magnitude. Close to 15 000 0000 times as much. That's not to say that work isn't needed to develop cheap recycling appliances, and to build water systems that recycle and reuse waste water rather than dumping it all into the environment, but it's not a very hard problem on the scale of things humanity can accomplish -- it mostly just requires more energy. Energy will continue to be the limiting factor for a long time, and eventually (after essentially perfect recycling of all material civilization requires) the limit will be waste heat. But as others have mentioned, we have a whole solar system to use as well, and moving the highest heat processes to space would allow us to radiate it away without affecting the earth. Technology which is clearly within our reach would allow the earth to support trillions of humans -- admittedly at a more crowded level than I would prefer. :) |
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Hm, I made a big mistake in that comment. I should have added that we have access to this much, but the real catch is energy and how we are currently limited to tapping into it and the total resource we can access is X.
Thank you so much for pointing this out.
>>> it mostly just requires more energy <<<
Yeah as I argued in another comment, that really is the unmentioned catch over here. I should have elaborated upon that in the parent. Sorry.
Even if most of humanity doesn't reach that level of consumption, we will need to start unlocking some of this resource sooner or later. What really worries me is the amount of energy we need to unlock all of this water locked away in glaciers, ice caps and so on and then actually manage to process and distribute it for final use.
That's a really interesting but hard engineering problem.
>>> Technology which is clearly within our reach would allow the earth to support trillions of humans -- admittedly at a more crowded level than I would prefer. :) <<<
Can you please elaborate more?