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Variations in atmospheric oxygen levels shaped Earth's climate through the ages

2015-06-11 23:02:00| Climate Ark Climate Change & Global Warming Newsfeed

ScienceDaily: Variations in the amount of oxygen in Earth's atmosphere significantly altered global climate throughout the planet's history. Efforts to reconstruct past climates must include this previously overlooked factor, a new University of Michigan-led study concludes. Oxygen currently comprises about 21 percent of Earth's atmosphere by volume but has varied between 10 percent and 35 percent over the past 541 million years. In periods when oxygen levels declined, the resulting drop in atmospheric density...

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