The world 's wildlife has declined by 27 percent since 1970 because of pollution . WWF : `` No one can escape the impact of biodiversity loss because reduced global diversity translates quite clearly into fewer new medicines , greater vulnerability to natural disasters , and greater effects from global warming , '' said James Leape , director-general of WWF International . Terrestrial , terrestrial , marine species all under threat . Agriculture and overall climate change are other factors causing loss of biodiversity .
The world 's wildlife has declined by 27 percent since 1970 because of pollution . WWF : Terrestrial , terrestrial , marine species all under threat . Agriculture and overall climate change are other factors causing loss of biodiversity .