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British Dictionary definitions for global dimming

global dimming

noun
  1. a decrease in the amount of sunlight reaching the surface of the earth, believed to be caused by pollution in the atmosphere
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012