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I think the air quality is far better today than it was in the 30-40 years ago. I moved to Los Angeles in the late 80s and in the first six months didn't even realize that there were mountains all around us. I just couldn't see them because of the smog. I can see the mountains clearly today.

That's my anecdotal evidence.

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Now do Beijing.

Damn, the wheels on those goalposts must be diesel-powered.

“It’s less smoggy in LA.” Is the “it works on my machine” of climate change denial.

It’s a global problem, and acknowledging that isn’t moving the goal posts. It’s reminding you that a first down is not a touchdown.

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