California at forefront of US battle on climate change

Tim Krantz still remembers a time when the pollution in Los Angeles was so bad it turned the sky yellow, making it hard to breathe and irritating the eyes. Today, the skies over the city are clear enough to see the Pacific Ocean from the Hollywood hills or the San Gabriel Mountains to the north. "I know how bad it used to be in the 1970s, you didn't see the mountains for months," said Krantz, a professor of environmental studies at the University of Redlands in California.

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