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Lush climates alone do not account for the vast biodiversity in tropical rainforests. Research on treefrogs from around the world, covering 123 sites and gathering DNA sequence data for 360 species of treefrogs, has provided a new understanding of biodiversity in tropical rainforests: some groups of treefrogs have existed together in the Amazon Basin for more than 60 million years. A more recent publication supports this finding, noting that forests in Canada and Europe may have much more in common with tropical rainforests than previously believed, but tropical forests have not been subjected to glaciations and mass extinctions, allowing for much greater biodiversity.
posted by filthy light thief on Sep 27, 2011 - 10 comments

Inspired by its 10th anniversary, the Earth Observatory has pulled together a special series of NASA satellite images documenting how the world has changed. From these images, Wired Science has made 5 videos, presenting convenient time-lapse views of the world changing (mainly) because of human actions. Watch the urbanization of Dubai, specifically the growth of Palm Jumeirah. See the Aral Sea dry up - once the fourth largest lake, down to 10 percent of its original size (marked by the thin black line in the video) by 2007. View the clearing the Amazon, as observed from above the state of Rondônia in western Brazil. Behold the return of Mesopotamia's Wetlands, now in the process of being restored from near total destruction under the regime of Saddam Hussein. Witness the impact of drought on Southern Utah's Lake Powell, where water level dropped from 20 million to 8 million acre-feet from 2000 to 2005.
posted by filthy light thief on Jun 4, 2009 - 12 comments