X | Shared With: Everyone - Oct 20 2007 | earth, science, biology, history
Quoted: But a billion years of bacterial evolutionary progress was soon stunted by a catastrophic global event. Geologists find no signs of a great meteor impact nor a volcanic eruption, but they have uncovered the unmistakable geologic scars of rapid worldwide climate change. Average temperatures, which were previously comparable to our present climate, plummeted to minus 50 degrees Celsius and brought the planet into its first major ice age.
- X | Shared With: Everyone - Oct 19 2007 | technology, space, earth, video, science, jiae
Quoted: TED Talks <a href="/speakers/view/id/129" target="_blank">Stephen Petranek</a> reveals the question that occupies scientists at the end of the day (and the beginning of happy hour): How might the world end? He lays out the challenges that face us in the drive to preserve the human race. Will we be wiped out by an asteroid? Eco-collapse? How about a particle accelerator gone wild?
- X | Shared With: Everyone - Jun 18 2007 | science, earth, environment
![An Earth Without People -- [ environment ]: Scientific American](http://i.faves.com/01/61/cf9b/b0998e78/55f8d87dee2c21246d_5.jpg)
Quoted: A new way to examine humanity's impact on the environment is to consider how the world would fare if all the people disappeared
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