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Anthropogenic Warming Goes Back to the 1930s

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The past 16 record-breaking hot years globally have removed the doubts of world leaders about the influence of human-caused climate change, but the first signs appear as far back as 1937 according to research published in Geophysical Research Letters (www.tinyurl.com/jc5rh6n).

“Globally, all the record-breaking hot years we’ve had since the 1990s are so much outside natural variability that they would be almost impossible without climate change caused by humans,” said lead author Dr Andrew King of the ARC Centre of Excellence for Climate System Science.

“In Australia, our research showed the last six record-breaking hot years and last three record-breaking hot summers were made much more likely due to global warming,” King said. “We were able to see climate change more clearly in Australia because of its position in the Southern Hemisphere in the middle of the ocean, far away from the cooling influence of high concentrations of industrial aerosols.”

Previous research has shown that aerosols in high concentrations over specific regions had a cooling effect, reflecting more heat back into space. However, warming returned rapidly when those aerosols were removed from the atmosphere.

Cooling periods, likely caused by aerosols, occurred in Central England, Central US, Central...

The full text of this article can be purchased from Informit.