Earth was stressed before dinosaur extinction: Fossilized seashells show signs of global warming, ocean acidification leading up to asteroid impact 

By measuring the chemistry of fossilized seashells collected in Antarctica, researchers discovered that Earth was already experiencing carbon cycle instability before the asteroid impact that wiped out the dinosaurs.

Source: Earth was stressed before dinosaur extinction: Fossilized seashells show signs of global warming, ocean acidification leading up to asteroid impact — ScienceDaily

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