The dinosaur doomsday asteroid baked Earth for 100,000 years, new study finds. By analyzing microfossils, researchers determined global CO2 levels reached 2,300 parts per million following the impact. For comparison, CO2 levels recently climbed above 410ppm for the first time in millions of years.
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Some 66 million years ago, a city-sized asteroid set fire to the planet and began what was likely the worst day in history. Decades of research have helped illuminate the actual impact. But scientist


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