bcbm
6th March 2011, 20:22
Life on Earth is hurtling toward extinction levels comparable with those after the dinosaur-deleting asteroid impact of 65 million years ago, propelled forward by human activities, according to scientists from UC Berkeley.
This week, scientists announced that if current extinction rates continue unabated, and vulnerable species disappear, Earth could lose three-quarters of its species as soon as three centuries from now.
"That's a geological eyeblink," said Nicholas Matzke, a graduate student at UC Berkeley and author of a paper describing the doom-and-gloom scenario. "Once you lose species, you don't get them back. It takes millions of years to rebound from a mass extinction event."
This means that not too far in the future, backyards might not be buzzing with bees, bombarded by seagulls or shaded by redwood trees. And while that might seem far off, species already are disappearing on a global scale. In recent history, we've lost the dodo bird and the passenger pigeon, the Javan tiger and the Japanese sea lion, and now, maybe the eastern cougar -- declared extinct by the U.S. Fish and Wildlife Service on Wednesday. Amphibians, mammals, plants, fish -- none are immune to going the way of the dinosaurs, courtesy of the human impact on fragile ecosystems.
continued:
http://www.mercurynews.com/ci_17523672?nclick_check=1
This week, scientists announced that if current extinction rates continue unabated, and vulnerable species disappear, Earth could lose three-quarters of its species as soon as three centuries from now.
"That's a geological eyeblink," said Nicholas Matzke, a graduate student at UC Berkeley and author of a paper describing the doom-and-gloom scenario. "Once you lose species, you don't get them back. It takes millions of years to rebound from a mass extinction event."
This means that not too far in the future, backyards might not be buzzing with bees, bombarded by seagulls or shaded by redwood trees. And while that might seem far off, species already are disappearing on a global scale. In recent history, we've lost the dodo bird and the passenger pigeon, the Javan tiger and the Japanese sea lion, and now, maybe the eastern cougar -- declared extinct by the U.S. Fish and Wildlife Service on Wednesday. Amphibians, mammals, plants, fish -- none are immune to going the way of the dinosaurs, courtesy of the human impact on fragile ecosystems.
continued:
http://www.mercurynews.com/ci_17523672?nclick_check=1