Thursday, January 15, 2015

NASA scientist says Earth entered 20-30 year cooling stage in 2000

By Tamara Dietrich NASA scientist Norman Loeb observes the Earth's climate for a living, and what long-term observations clearly show is a rise in average global temperatures of 1.5 degrees F over the past 130 years or so.That rise isn't at a steady, unbroken pace, however — on a chart, it looks more like a stock market graph, with jagged ups and downs built into a long, upward trend. And built into that long, upward trend are periods — called hiatuses — when average temperatures level out a bit for 20 or 30 years before climbing again.What satellite and other Earth observations are showing is that the planet entered one of those hiatuses in the early 2000s, Loeb said. And it continues today. But that doesn't mean the Earth's temperature isn't still climbing overall.



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