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Indoor farming will not be cheaper, efficient, or environmentally friendly. It will be more expensive because it has to supply all of its inputs while outdoor farms get a _massive_ energy subsidy from the Sun. The amount of energy required to deliver food from a farm to the grocery is NOTHING compared to the energy we spend getting it from grocery to table; indoor farming will change none of that. It is a delusional pipe-dream from people who do not understand modern agriculture.

Ok, this article claims the productivity: http://weburbanist.com/2015/01/11/worlds-largest-indoor-farm...

Let me find a research paper and see if it is really valid or not

So, I still don't find any reason why vertical farming, which is indoors is a problem: https://en.wikipedia.org/wiki/Vertical_farming

What are your thoughts on this?

I'd like to hear an explanation why vertical farming, which is indoors is not a good choice.

Downvotes do not give enough information.

Can someone explain the downvotes?