Gulf 'dead zone' to grow dramatically due to federal biofuel mandate

A new study says efforts to shrink the massive, oxygen-depleted dead zone in the Gulf of Mexico will be stifled if the U.S. continues to increase its biofuel production.

Every year copious amounts of fertilizer and nutrient-rich sentiment dump into the Gulf of Mexico from the mouth of the Mississippi River, feeding massive algae blooms so large that they starve the ocean of oxygen. These oxygen-depleted waters, which last year grew to the size of Massachusetts, form a vast “dead zone” completely devoid of all marine life.

Now a new study, published in the journal Environmental Science & Technology, says the problem stands to get far worse if the U.S. follows through on its current federally-mandated efforts to increase annual biofuel production to 36 billion gallons by 2022.

The federal mandate, which was passed by Congress in 2007 in an effort to reduce America’s reliance on foreign oil, set targets for the U.S. to blend 36 billion gallons of biofuels a year into the U.S. fuel supply, up from the 11.1 billion gallons projected to be blended this year. That would increase biofuels’ share of the liquid-fuel mix to roughly 16% from 5%, based on U.S. Energy Information Administration fuel-demand projections.

That may be good for releasing America’s reliance on oil, but an increase in biofuel production that large would also mean more fertilizers washing off farm fields throughout the Mississippi River basin, which could be devastating to both the Gulf’s marine ecosystems and its fishing and shrimping industry.

The most intense hypoxia levels (areas which are low in oxygen) are usually between 30 to 60 feet below the surface. Fish in this area can be “stressed”, meaning they can die of suffocation or, at the very least, move to other areas, which adversely affects fishermen in the dead zone region.

The zone is already 17-21 percent larger than it was in 1985 when it was first measured, and the five largest Gulf dead zones on record have occurred since 2001, with the largest measuring at a sprawling 8,894 square miles. “The growth of these dead zones is an ecological time bomb,” said ecologist Donald Scavia, a professor at the U. of Michigan School of Natural Resources and Environment.

Mother Nature Network