Is that $20,000 for the cost from the earth to the moon?
Because I would guess you could escape moon gravity and fall towards earth for a lot less than $20,000 per liter.
And large chunks of ice, hurled from the moon, would just melt in our atmosphere. Which is OK if you don't care to deliver water to anyone in particular and just want more of it on earth. You know, in case global warming doesn't raise sea levels enough.
Just send solar powered robots at in initial cost of $20,000 per kilo to mine the ice, and have them hurl it at earth for a lot less than $20,000 per liter.
$20,000 is cost of taking Earth water into space, and hopefully dumping it on the moon. That's compared to however much it is for existing moon-dwellers to setup and mine water from the moon.
Because I would guess you could escape moon gravity and fall towards earth for a lot less than $20,000 per liter.
And large chunks of ice, hurled from the moon, would just melt in our atmosphere. Which is OK if you don't care to deliver water to anyone in particular and just want more of it on earth. You know, in case global warming doesn't raise sea levels enough.
Just send solar powered robots at in initial cost of $20,000 per kilo to mine the ice, and have them hurl it at earth for a lot less than $20,000 per liter.