Environment: City v. Forest

Most Americans still think of urban blight in terms of immediate effects: filth, smoke and noise that all can see, smell and hear. But dirty cities affect far more than the people in them; they also poison the distant countryside—as Los Angeles is now doing to the San Bernardino National Forest, which is fully 80 miles away.

Swept east by wind, the city's smog is killing the forest's majestic ponderosa pines at the rate of 3% a year. Incense cedar and white fir have also suffered. In all, the smog has caused moderate to severe damage in 60% of the forest's 160,000...

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