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You're answering the wrong question.

"How do you feed the number of people we expect to have on the planet in 30 years time?"

Wrong question.

"How many people can we expect to feed given the best possible conversion of sunlight into food?"

Right question.

Then you have to ask, "are we prepared to do that to our planet, or do we need to start seriously thinking about population control?"

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I don't see why food production should be limited to sunlight: we're likely going to have fusion power before we hit any kind of real food cap (ie, limit on growing rather than hunger based on poverty or distribution problems).

Why not grow large tanks of GMO algae with fusion power?

GMO algae or yeast grown in tanks as a complete protein to replace the resource wasteful meat we eat so much of is a really good idea.

I expect it is the future and wish there were more work being done on it right now.

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