Coral Growing at Slowest Rate in 400 Years

The Great Barrier Reef is among the world's greatest reefs, but it is not immune to global warming, and could disappear this century.

Photo: Richard Ling / Wikimedia Commons

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New research is bringing national attention to the world's imperiled coral reefs. Australia's great barrier reef is growing at its slowest rate in 400 years, due most likely to global warming, ocean acidification and other environmental threats.

While scientists have been raising these issues for several years, this week saw the story reach national prominence, as it was highlighted as a top story on NPR, among other news outlets.

Ocean scientists from around the world recently agreed to a framework to save the oceans from one of the great sleeper environmental issues of our day: ocean acidification.

Like global warming, ocean acidification is caused primarily by human emissions of carbon dioxide. In the atmosphere, that carbon helps to trap heat near the Earth's surface. In the oceans, it makes the water more acidic.

That increasingly acidic water threatens the viability of plankton, at the base of the food chain, as well as coral, because the acidic conditions prevent the formation of calcium carbonate shells. Some studies suggest many coral reefs will have died due to acidification by the middle or end of this century. Coral reefs are the nurseries of the oceans, producing abundant fish of diverse species — making them hot spots for tourism and important areas for the fishing industry. Scientists at the International Coral Reef Symposium last July declared ocean acidification the largest and most significant threat to oceans, a significant statement, considering the vast body of evidence that overfishing and other forms of pollution are taking a massive toll on ocean life.

The scientists, convened by The Nature Conservancy in August, have agreed to the "Honolulu Declaration on Ocean Acidification and Reef Management." Here are some of its key elements:

1. Limit fossil fuel emissions
2. Build the resilience of tropical marine ecosystems and communities to maximize their ability to resist and recover from climate change impacts, including ocean acidification
3. Create new marine reserves that include those reefs less vulnerable to acidification, and consider climate change as a factor in managing existing reserves
4. Increase money spent on science and develop an international network to monitor and study acidification
5. Decrease other stresses to coral reefs, such as agricultural runoff and overfishing

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