18 points

Most deserts have life, which you would kill. But for sandy deserts, have you never built a sand castle?

The reasons are legion, starting with the fact that it wouldn’t work.

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74 points

Most land based plants would die if fed saltwater.

The water would in most cases sink away below the surface too.

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6 points

While that’s true, a large saltwater deposit somewhere arid would allow for water to evaporate into the air and create humidity and increase the probability of rain occurring in that area regularly.

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31 points

If by “large Saltwater deposit” you mean “an ocean” then maybe. Pumped sea water? No.

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-25 points

Is rain, too, not salty?

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20 points

Compared to a river, yes. Compared to the ocean, no.

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7 points

No. The salt gets left behind when water evaporates.

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16 points

Rainwater typically has a TDS of 20 mg/L or less. Fresh water from lakes, rivers, and groundwater is more variable, with TDS ranging from 20 mg/L to approximately 1,000 mg/L. Brackish water is, by definition, water with TDS exceeding 1,000 mg/L and ranging as high as that of seawater, at approximately 35,000 mg/L.

https://watereuse.org/salinity-management/ls/ls_3d.html

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8 points

A lot of deserts get a fresh water pulse occasionally, and things spring back to life. If you take that away it destroys more ecology. You’re better off making multilevel greenspace in the cities.

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7 points

If the ice caps keep melting, we’re going to see what happens! In real time

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3 points
*

I’m just saying we coincidentally also have a problem with billions of plastic water bottles littering up the place.

Now, call me a fool, but…

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4 points

Aside from the issues stated already. This would need to be a truly monstrous amount of water. The cost would simply be far too much to justify any sort of benefit.

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