"A rolling "dead zone" off the Gulf of Mexico is killing sea life and destroying livelihoods. Recent estimates put the blob at nearly the size of New Jersey.
"Alas, I'm not talking about the Deepwater Horizon oil spill. As terrible as that catastrophe is, such accidents have occurred in U.S. waters only about once every 40 years (and globally about once every 20 years). I'm talking about the dead zone largely caused by fertilizer runoff from American farms along the Mississippi and Atchafalaya river basins. Such pollutants cause huge algae plumes that result in oxygen starvation in the Gulf's richest waters, near the delta."