From the archives.
Our Earth and Sun continue to have a delicate relationship. Credit: Image Science and Analysis Laboratory, NASA-Johnson Space Center.
Complex life here on earth will hit a habitability wall in only 500 million years; not in an almost languorous 1.75 billion years, as reported in a recent global media flap.
The flap — spurred by a paper in the journal Astrobiology — failed to cover earth’s future carbon dioxide (CO2) “compensation limit,” says James Kasting, a prominent planetary scientist at Penn State University, whose own models were used by the paper’s authors.
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