Our Changing World for 9 September 2010 -Ocean Acidification

Ocean acidification has been called many things - The Other Carbon Dioxide Problem, and even Global Warming's Evil Twin. It's the result of oceans absorbing excess carbon dioxide from the air, and it's happening very quickly at the moment. Alison Ballance talks with marine biologists to find out what more acidic seawater might mean for marine creatures that use calcium carbonate to make shells.