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I enjoy eating too much. However it would be an awesome way to fix starvation during droughts when the sun is shining brightly.

You still need water for photosynthesis.

But apparently salt water is fine. No shortage of that.

Photosynthesis will not give us the ability to ingest huge amounts of salt without consequence. ;)

Huh, so that's why my plants keep dying.

It wouldn't work for warm blooded creatures - we use too much energy to be supplied by the sun on our skin.