Hazy Days In Our Parks

The air in many national wilderness wonderlands is getting worse. As officials debate controversial new rules to curb pollution, scientists find the sources are surprisingly far-flung

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As Tweed lists the man-made threats to the parks—climate change, invasive species, forests choked by overzealous fire suppression, nitrogen air pollutants that overfertilize plants, ozone—he’s not optimistic that Moro Rock Independence Day viewing will return any time soon. “We are making it harder and harder to carry out the legal mandate to maintain these parks in their natural state,” Tweed says. “What we don’t know now is, can we ever get back?”


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