Pythons turn their food into meat pretty efficiently, a study finds, making them an intriguing alternative to climate-unfriendly cows. Put aside your chicken cutlets and meatloaf and say hello to python curries and satay skewers. Some snake scientists think eating these reptiles—already customary or at least acceptable in parts of the world—might help lessen the damage our food choices have on the environment. With some eight billion people on the planet today, all of whom require protein to stay healthy, finding new sources of these nutrients is a crucial issue. But how do you get from the challenge of providing...