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Ocean acidification

3-4 billion years ago, the pH level of the ocean was between 6.0 and 7.5 - something between cow's milk and human blood. Source: pixabay.com.

In the beginning the sea was acidic

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Heads of state at the climate conference in Paris. Photo: Drop of Light / Shutterstock.com

"All the warning lights are already flashing - now we just need someone to start taking them seriously"

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