CNN International
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"This is definitely human impact, we're in the sixth mass extinction. There's only been five before this and we're definitely in the sixth," the World Wildlife Fund told CNN.


Two-thirds of wildlife could be gone by 2020: WWF report
Since 1970, there has already been a 58% overall decline in the numbers of fish, mammals, birds and reptiles worldwide.
CNN.COM|DE BEN WESTCOTT, CNN