less coral reefs

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Coral reefs will be the first global ecosystem to collapse in our lifetimes. More than 450 scientists from over 60 countries are participating in the “Effects of Climate Change on the World’s Oceans” symposium. When CO2 in the atmosphere reaches a concentration of 450 to 500 parts per million (ppm), the oceans will mostly be too acidic for corals to grow.
IPS News, May 2008