WWF said 52 % of wildlife disappeared between 1970 and 2010 . The decline in animals living in rivers , lakes and wetlands is the worst . The index showed shows a 52 % decline in wildlife between 1970 and 2010 , far more than earlier estimates of 30 % . Comment:
WWF said 52 % of wildlife disappeared between 1970 and 2010 . The decline in animals living in rivers , lakes and wetlands is the worst . Comment: