A new study estimates that about half the atmospheric warming that has taken place since the mid-1970s can be attributed to natural changes in ocean currents that heat and cool the planet.
Dr. Roy Spencer of the University of Alabama found that by including historical observations of the El Niño Pacific Ocean warming events about 50 percent of the global warming usually attributed to carbon dioxide is instead caused by the altered ocean currents.
Spencer’s study, to be published in the in the Asia-Pacific Journal of Atmospheric Science, reveals that the amount of warming from a doubling of carbon dioxide concentrations is about half of what most man-caused global warming advocates expect.
“Basically, previously it was believed that if we doubled the CO2 in the atmosphere, sea surface temperatures would warm about 2.5 C,” Spencer told The Daily Caller. “But when we factor in the ENSO warming, we see only a 1.3 C final total warming after the climate system has adjusted to having twice as much CO2.”
Spencer’s research suggests that the earth’s atmosphere could currently be in a cooling period which would explain zero warming since 1998.
You can see Dr. Spencer’s paper here.
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