At age 15, Bill Wren moved with his family to Houston. It was a jarring experience—when he looked up at night, he could no longer see the stars. Though he didn't yet have a name for it, this was his introduction to the growing problem of light pollution. Bill Wren has spent decades helping to preserve dark skies. Today, one-third of humanity—including 80 percent of Americans—can no longer see the Milky Way. https://www.sierraclub.org/sierra/2022-2-summer/do-gooder/how-best-protect-night-sky?utm_source=instagram&utm_campaign=sierramag&utm_medium=social Photo by Jason Weingart