First Principle Calculations for Land Required to Feed One Person

Insolation is 1000 W/M2.

A person uses about 100W - [1] or 8M Joules per day.

Potatoes produce 40,000 lb per acre in Idaho - [2]. There are 350 Calories in a pound of potatoes - [3]. A person needs 6 lb of potatoes per day. That means 2000 lb per year, or 1/20 of an acre. 1/20 of an acre is 2,200 sf.

So how to reduce this to a greenhouse? You have to eat your lawn! How? By Oyster mushrooms. But, there are only 159 Calories in a pound of Oyster mushrooms - [4].

All right, we need to go further. 1 egg is 78 calories - [5].

Add one pound of Tilapia - 435 Calories. [6].