Check out this informative little movie on The Dead Zones in the Gulf of Mexico at http://www.nnvl.noaa.gov/MediaDetail.php?MediaID=84&MediaTypeID=2

A surprising 41% of the nations urban and farm water runoff drains into the Mississippi River and out into the Gulf of Mexico.

Every year, as a result of this runoff, dead zones occur in the Gulf of Mexico.

This year there is concern that the Gulf Oil Spill will create greater dead zone areas, check out: NOAA-Supported Scientists Predict “Larger Than Average” Gulf Dead Zone