Agricultural pollution has a caused a 'Dead Zone ' in Mississippi . The `` Dead Zone '' varies in size each year , but in 1999 it was 7,728 square miles -- Globally the number of Dead Zones has doubled 1960 since the 1960 's . The drive to increase biofuel production could increase pollution in rivers and seas . Pesticide use rose 30 percent in the China 1960 .
Agricultural pollution has a caused a 'Dead Zone ' in Mississippi . Globally the number of Dead Zones has doubled 1960 since the 1960 's . The drive to increase biofuel production could increase pollution in rivers and seas . Pesticide use rose 30 percent in the China 1960 .