I did some napkin math, and it doesn’t seem too feasible: https://news.ycombinator.com/item?id=20713552 https://news.ycombinator.com/item?id=20713552 The TL;DR

I did some napkin math, and it doesn’t seem too feasible: https://news.ycombinator.com/item?id=20713552 https://news.ycombinator.com/item?id=20713552 The TL;DR was: in order to supply 1.5 billion cows with the seaweed we might need up to 291.000 metric tons of algae per day. ~ 106 Million metric tons per year. In 2014 the world wide Aquatic Plants (which include ALL Macro-Algae) production was around 27 Million tons [0]. [0]: http://www.fao.org/3/a-i5555e.pdf http://www.fao.org/3/a-i5555e.pdf, page 24, table 7