New York Times: WHEN he was just 11 years old and living in Princeton, Robert Stone borrowed his parents’ Super 8 camera and made his first film, about the pollution he saw around him. He made it in honor of the country’s first Earth Day, which was held that year. Thirty-nine years later, Mr. Stone, now a well-known documentary filmmaker, has made “Earth Days,” a film about the start of the environmental movement in this country. It was recently given the honor of being chosen as the closing film at …