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Still Waters

Pollution creating acid oceans

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The world's oceans are becoming acidic at a faster rate than at any time in the last 65 million years, threatening marine life and food supplies across the globe, according to a new study.

Researchers from the University of Bristol looked at how levels of acid in the ocean have changed over history.

They found that as ocean acidification accelerated it caused mass extinctions at the bottom of the food chain that could threaten whole ecosystems in the future.

The rapid acidification today is being caused by the massive amount of carbon dioxide being pumped out by cars and factories every year, which is absorbed by the water. Since the industrial revolution acidity in the seas have increased by 30 per cent.

The last time such a fast change occurred is thought to be 65 million years ago, when some natural event caused ocean acidification and the dinosaurs died out.

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