(BBC) This year could see the biggest "dead zone" since records began form in the waters of the Gulf of Mexico. Scientists say conditions are right for the zone to exceed last summer's 6,662 sq miles (17,255 sq km). The dead zone is an area of water virtually devoid of oxygen which cannot support marine life.
It is caused by nutrients such as fertilisers flowing
into the Gulf, stimulating the growth of algae which absorbs the
available oxygen. Read more.
Gulf dead zone to be biggest ever
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