"Dead zones" in US coastal waters have grown 30-fold since 1960, according to a recent government report. This report refers to which of the following environmental pollution issues?

The correct answer will be "Eutrophication caused by fertilizer and detergent runoff".

Explanation:

Dead Zones, particularly throughout the Gulf of Mexico, become generally caused through phosphates and nitrates load capacity from farmland.Agricultures in the Midwest which underground tunnels waterways as well as down the Mississippi and through the gulf coast whereby individuals choked out an existence.

So that the above would be the right choice.