Alison Teal walking through “Trash Island,” a giant landfill in the Maldives that gets up to 400 tons of trash per day. (photo: Sarah Lee)

Alison Teal walking through “Trash Island,” a giant landfill in the Maldives that gets up to 400 tons of trash per day. (photo: Sarah Lee)

In this Nov. 10, 2013 photo provided by Brandon Holton, a Wildlife Biologist with the Science and Resource Management at the at the Grand Canyon National Park, elks interact with visitors at the south kaibab water station at the Grand Canyon National Park in Arizona. The animals are helping themselves by lifting the spring-loaded levers at the stations with their noses and letting the water flow. Officials at the Grand Canyon plan to elk-proof the stations to outsmart the animals, conserve water and protect visitors from aggressive behavior. (AP Photo/U.S. National Park Service)The Associated Press

In this Nov. 10, 2013 photo provided by Brandon Holton, a Wildlife Biologist with the Science and Resource Management at the at the Grand Canyon National Park, elks interact with visitors at the south kaibab water station at the Grand Canyon National Park in Arizona. The animals are helping themselves by lifting the spring-loaded levers at the stations with their noses and letting the water flow. Officials at the Grand Canyon plan to elk-proof the stations to outsmart the animals, conserve water and protect visitors from aggressive behavior. (AP Photo/U.S. National Park Service)The Associated Press

Wildlife Numbers Cut in Half in Just 40 Years : Discovery News

Wildlife numbers have plunged by more than half in just 40 years as Earth’s human population has nearly doubled, a survey of over 3,000 vertebrate species revealed on Tuesday.

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From 1970 to 2010, there was a 39-percent drop in numbers across a representative sample of land- and sea-dwelling species, while freshwater populations declined 76 percent, the green group WWF said in its 2014 Living Planet Report.