![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgKmBsYS1ZD-U7w5P7646txM3LvdoPDJqlVQ7ef3onYd4zPVBzPQdALfyGWm6rrlQSignp43ITJvilSM3aYUXCncmOJsWET7uvOuWIeFN5NyJM0AMZiRP1KtaNBhvJCKRj-2p0cCxUYafcN/s200/Giant_clam_or_Tridacna_gigas.jpg)
Tracing the geological history of coral reefs over hundreds of millions of years, Veron said reefs lead a boom-and-bust existence, which appears to be correlated with atmospheric carbon dioxide levels. With CO2 emissions rising sharply from human activities, reefs—which are home to perhaps a quarter of marine species and provide critical protection for coastlines—are poised for a "bust" on a scale unlike anything seen in tens of millions of years….
Giant clam or Tridacna gigas. Photographed by Jan Derk in November 2002 on the Great Barrier Reef, Australia
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