I've followed the health food biz for decades and there were claims that spirulina would feed the starving world. Building algae ponds just doesn't seem to compute. Spirulina is never less than $25/lb. So much for a mass solution to starvation.
Algae researchers have been stumped by two problems: invasion of high-oil-content algae by low-oil indigenous versions, and the costs of regulating temperatures in ponds.
This must plague those who grow health food store algae. Lots of which is grown in Hawaii
The diesel algae is grown in sealed tanks, not open ones.......