The use of birth control has been an issue debated by ethicists in the United States for over a century. Until now, it’s been a moral issue, and few mainstream voices ever advocated the use of birth control for environmental reasons. On Scientific American’s website, an Oct. 11 article by David Biello argues that if we were able to lower the growth of the world’s population, the amount of carbon that is expected to be emitted into the atmosphere would significantly diminish. He cited a study from the U.S. National Center for Atmospheric Research that explained demographic ties to the...