Today atmospheric carbon dioxide is at its highest level in at least several million years thanks to widespread combustion of fossil fuels by humans over the past couple centuries.
But where does 419 parts per million (ppm) — the current concentration of the greenhouse gas in the atmosphere — fit in Earth’s history?
That’s a question an international community of scientists, featuring key contributions by University of Utah geologists, is sorting out by examining a plethora of markers in the geologic record that offer clues about the contents of ancient atmospheres. Their initial study…
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News Source: www.sciencedaily.com