this post was submitted on 05 Jul 2026
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No, you're just wrong. It is a thing for profitable vegetables or leafy greens or strawberries, but not for producing calories. It will not feed 15 billion people.
With something like 3 kWh of solar irradiance per day per m² you get a pretty abysmal <5% efficiency for producing food calories compared to the 20% efficiency of solar panels. So you quintuple the amount of land you need with solar panels, maybe a little less with higher efficiency indoors. Less with kite power. Again less with fusion power. It's still alot of embedded energy.
I made this table to see how many square meters actually feeds a person, very rough numbers but all I've found. It's less than 250m² in moderate climates to produce 2.2 kcal food. If we stop eating meat and "luxury foods" from around the world we drastically reduce energy costs and reduce land use so we can rewild like 90% of the current arable land.
Conclusion: There is no shortage of land to feed 15 billion people.
And why grow your vegetables and fruits and strawberries far off, or in a bunker, when you can build a million local greenhouses in your community that could additionally serve as food gardens or parks in colder weather?
PS: Solein claims 5% by splitting water into hydrogen using solar power and then using hydrogen to feed single celled organisms. If we ever find a way to split water into hydrogen directly using fusion we'd be set. But until then it's not more efficient than other food algae (also about 5% efficient, which is already great for mostly protein).
If you think leafy greens are only good for making a profit, then you're the one who's wrong. Nutrition is about more than just calories. Someone who doesn't get enough calories gets malnourished, someone who doesn't get enough nutrients gets malnutrition. It's two different things. Vegetables are necessary and you can't just write them off, much as you seem to want to.
Also, a vertical warehouse operation has multiple stories and can have panels mounted all up the southern face. You don't need to have an entirely horizontal solar farm, so no it doesn't quintuple the land you need.
And yes, eliminating meat from the common diet can help to rewild arable land, but that's a completely separate conversation and not an argument against warehouse agriculture.
Saying there's no shortage of land to feed 15 billion people is irresponsible though, because without any major changes to the way things are done, feeding 15 billion people would absolutely result in more habitat destruction.
You don't seem to understand the issue at all. Building a million "local" greenhouses takes up space. Each greenhouse has a footprint. The millionth one over won't be very "local."
The point of warehouse farming (rather, one of the points), is that it can be done in urban centers where there's no space for greenhouses. It's literally a solution for food deserts and transport costs associated with the majority of food being produced in rural areas. Warehouse agriculture brings food production closer to population centers. I've already pointed that out multiple times and you just seem to ignore it.
That's not what fusion is at all. I've already corrected you on this, which you also ignored.
Nuclear fusion is when you take two atoms and fuse them into a different kind of atom. The simplest form is making one helium atom from two hydrogen isotopes.
It has nothing to do with "splitting water into hydrogen." We can already do that. It's called electrolysis. Plants need more than just hydrogen though, so I'm not sure what your point is there.
You didn't correct me, you misunderstood me. See https://en.wikipedia.org/wiki/Radiolysis#Hydrogen_production
Solein (single celled microorganism) can use hydrogen and oxygen as fuel to produce carbo hydrates and protein. Needs co2 and some minerals too of course. If you could genetically engineer it to taste good and look less like puke, it would be perfect.
Okay, good luck with that. You go feed your people hydroslop and I'll build warehouse farms and we'll see whose people have better nutrition.
Also, the radiolysis page says nothing about fusion. The nuclear waste it talks about repurposing is from fission reactors. Keep up.