What happened in the ocean millions of years ago could repeat

What happened in the ocean millions of years ago could repeat

Ancient limestones reveal how volcanic carbon once suffocated the oceans - offering a stark warning as modern oxygen levels continue to drop.

Earth's Atmosphere Hasn't Had This Much CO2 in Millions of Years

Earth's atmosphere now has more carbon dioxide in it than it has in millions -- and possibly tens of millions -- of years, according to data released last month by the National Oceanic and Atmospheric Administration and scientists at the University of California San Diego. From a report: For the fir...