World ocean coral is being killed by algae fed on nutrient pollution that all nations need to manage through sanitation and specialized sewage treatment.

Impact of sewage and deep dredging nutrient pollution is destroying ocean food web supply of essential protein required by humans worldwide. Supply of free or low cost food from the sea is failing and causing food cost inflation.

Economists appear oblivious to impact of aquaculture except that in Australia at least, wild fish that used to be food for poorer people has been removed from the Consumer Price Index.