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In the future food will be grown closer to the city in verticle farms. When that happens what will these folks do?

This a bit like AI. It's 2018. Where are your vertical farms? You want to talk efficiency, soil on the ground will be more efficient than soil in the air for at least the next 50 to 100 years.

Eventually we'll even live in starships and colonize distant planets if we don't kill ourselves first, but I'm going to go out on a limb and say that will not be our defacto mode of living in my life time, and the same goes for vertical farms.

Please note soil will not be used in verticle farms. The limiting factor is the cost of electricity. Please note the curve of the cost of electricity over time its downward trending and will eventually be closer to zero.

Are you sure it will be sustainable for feeding ~8 billion people (Yes, I am talking about the world in general)? Agriculture also creates ecosystem needed to sustain the planet. Not just feed people.

Yes, I am pretty sure of this based on the startups in this area. Like AI this thing will sneak up on you.

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