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Global wildlife populations will decline by 67% by 2020 unless urgent action is taken to reduce human impact on species and ecosystems, warns the biennial Living Planet Index report from WWF (World Wide Fund for Nature) and ZSL (Zoological Society of London). From elephants to eels, here are some of the wildlife populations most affected by human activity. Here: African elephants are under intense pressure from poaching and the fragmentation of habitat. Populations in Tanzania have declined by 60% between 2009 and 2014. (Photo by Martin Harvey/WWF/PA Wire)
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