Dinosaur-killing impact acidified oceans: study

The space rock that smashed into Earth 65 million years ago, famously wiping out the dinosaurs, unleashed acid rain that turned the ocean surface into a witches' brew, researchers said Sunday.

Tidal landscapes: A greater carbon sink than previously thought

Mangroves and saltmarshes sequester large amounts of carbon, mitigating the greenhouse effect. New research from the University of Gothenburg shows that these environments are perhaps twice as effective as previously thought.

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