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New climate change signal: oceans turning acidic

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(Read caption) A gam of Minke whales pass icebergs in the Southern Ocean off the Australian Antarctic Territory in this December 2007 file photo.

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COPENHAGEN, DENMARK -- Forget "climategate" and arguments over whether the Earth is really warming. If you need a simple, non-controversial scientific reason to support curtailing greenhouse gas emissions, stop looking skyward and look at the pH of the oceans.

At least that's the argument Jeffrey Short made Tuesday at the global climate change summit in Copenhagen. Dr. Short, the Pacific science director for Oceana, an environmental group working to protect the world's oceans, says that regardless of the impact on climate, the billions of tons of carbon-dioxide (CO2) that human activity pumps out every year is making oceans more acidic.

That's threatening fisheries that millions rely on for food and livelihoods. Already some shellfish, from commercially important crabs, clams, and mussels to tiny creatures called pteropods (dubbed the "potato chips of the ocean" for the important rung they occupy near the bottom of the marine food chain), are showing the effects of ocean acidification. Coral reefs, important nurseries for commercial fish species, are also being threatened.

The damage to the oceans should be enough on its own to push policy makers to sign a global agreement to reduce CO2 emissions, "even if carbon dioxide didn't do anything to warm the atmosphere," says Short, who spent more than 30 years as a marine scientist at the National Oceanic and Atmospheric Administration (NOAA) before entering the policy arena.

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