In a move that conservationists are calling the “single greatest measure” in the fight to save elephants from poaching, China is finally getting set to close its ivory carving factories. China has the world’s largest market for ivory. Now the government is closing down commercial sales for good, a move that comes 18 months after China made an agreement with the U.S. to shut down its elephant tusk trade. If enforced vigorously, it could help spare many elephants from the evil practice of poaching.