We are our own asteroids

Ok maybe the image of the Death Star blowing up is kind of extreme, but I saw all the Star Wars movies on sale for sooo cheap at Walmart today. I have to go back and get them.

More than a decade ago, many scientists claimed that humans were demonstrating a capacity to force a major global catastrophe that would lead to a traumatic shift in climate, an intolerable level of destruction of natural habitats, and an extinction event that could eliminate 30 to 50 percent of all living species by the middle of the 21st century. Now those predictions are coming true. The evidence shows that species loss today is accelerating. We find ourselves uncomfortably privileged to be witnessing a mass extinction event as it's taking place, in real time.

The fossil record reveals some extraordinarily destructive events in the past, when species losses were huge, synchronous and global in scale. Paleontologists recognize at least five of these mass extinction events, the last of which occurred about 65 million years ago and wiped out all those big, charismatic dinosaurs (except their bird descendants) and at least 70 percent of all other species. (...)

In 2007, of 41,415 species assessed for the International Union for the Conservation of Nature (IUCN) Red List of Threatened Species, 16,306 (39 percent) were categorized as threatened with extinction: one in three amphibians, one quarter of the world's pines and other coniferous trees, one in eight birds and one in four mammals. Another study identified 595 "centers of imminent extinction" in tropical forests, on islands and in mountainous areas. Disturbingly, only one-third of the sites surveyed were legally protected, and most were surrounded by areas densely populated by humans. We may not be able to determine the cause of past extinction events, but this time we have, indisputably: We are our own asteroids.

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