The world 's wildlife has declined by 27 percent since 1970 because of humans . Comment: Terrestrial , freshwater , marine species all under threat . Pollution and overall climate change are other factors causing loss of wildlife .
The world 's wildlife has declined by 27 percent since 1970 because of humans . WWF : Terrestrial , freshwater , marine species all under threat . Pollution and overall climate change are other factors causing loss of wildlife .