World wildlife populations have halved in last 40 years

[quote]The global loss of species is even worse than previously thought, the London Zoological Society (ZSL) says in its new Living Planet Index. The report suggests populations have halved in 40 years, as new methodology gives more alarming results than in a report two years ago. The report says populations of mammals, birds, reptiles, amphibians and fish have declined by an average of 52%. Populations of freshwater species have suffered an even worse fall of 76%.[/quote] [url]http://www.bbc.com/news/science-environment-29418983[/url] This makes me sad. And although such a report isn't going to be completely reliable, it's an alarming outlook on our impact on the planet. I have to wonder how different the world will be in another 50 years. For reference, the extinction at the end of the Cretaceous period wiped out some 75% of species on the planet