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Earth

Coral reefs create clouds to control the climate

By Alison George

2 February 2005

WHEN the temperature soars, coral reefs might cool off by creating their own clouds.

Research from the Great Barrier Reef off the Australian coast shows that corals are packed full of the chemical dimethyl sulphide or DMS. When released into the atmosphere, DMS helps clouds to form, which could have a large impact on the local climate.

In the air, DMS is transformed into an aerosol of tiny particles on which water vapour can condense to form clouds. This sulphur compound is also produced in large amounts by marine algae and gives the ocean its distinctive smell. Algae play a…

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