A small but growing number of environmentalists in the U.S. have decided to get vasectomies to ensure they don’t have children and contribute to the population problem. Jeff Miller, a 38-year-old activist in Berkeley, Calif., who got a vasectomy when he was 26, said, “It’s one small thing that I can do. There are too many people and too few wolves, grizzlies, salmon — all the wild critters.” Mark, a 38-year-old San Francisco musician who got a vasectomy four years ago, said he lost the love of his life over the issue, but he felt strongly about not having any children. He said, “Unless [population is] addressed, there’s no hope for solving our environmental problems.”