The world's wildlife has declined by nearly a third over the past 40 years, a new estimate of the health of the planet suggests. In some parts the figure is much higher – in the tropics, losses are estimated at more than 50 per cent, while in tropical freshwater ecosystems specifically, average losses may be as high as 70 per cent, according to the 2012 edition of the Living Planet Report, produced by the WWF.
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