"Society's emissions of carbon dioxide may or may not turn out to have something significant to do with global warming-the jury is still out."

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Carbon dioxide pollution is transforming the chemistry of the ocean, rapidly making the water more acidic. In decades, rising ocean acidity may challenge life on a scale that has not occurred for tens of millions of years. So we confront an urgent choice: to move beyond fossil fuels or to risk turning the ocean into a sea of weeds.

— Sigourney Weaver