# First Principle Land Requirements to Feed a Person

A person uses 100w of energy from food. [1]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Duckweed captures thus 10W per square meter. Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.

If duckweed gets 10W per meter squared capture - we need 10 sq m or 1/400 acre. Very promising. The fish there are a trophic chain loss, so if we have another crop that produces at 1% - then 1/400 of an acre is sufficient to feed a vegetarian on first principle calculations - just for the carbohydrate. That is 100 square feet!

Now fish are in principle very efficient converters of feed to body mass - so if that factor of loss is 50% at best, then the pescaterian requires 20 sq meters of land to feed them¡!!!!!!!!!

Doomsday? I don't think so.