"The average speed of surface winds over most regions in the northern hemisphere have dropped significantly in the past three decades, according to a study published online by Nature magazine last month."
"Tang Jianping, an associate professor at Nanjing University's College of Atmospheric Sciences, said meteorologists on the mainland noticed a long time ago that winds were slowing down. The increase in surface drag caused by urbanisation might explain the slowdown near cities, but it could not explain why monsoon winds from the sea had slowed as well, he said."
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