Scientific American: Why not split harmful carbon dioxide into harmless carbon and oxygen? James E. Miller, a chemical engineer at Sandia National Laboratories, breaks it down Instead of sequestering carbon dioxide to reduce its effects on global climate, why don’t we split it into harmless carbon and oxygen? –J. Henderson, Devon, Pa. James E. Miller, a chemical engineer at Sandia National Laboratories, breaks it down: Splitting carbon dioxide (CO2) into carbon and oxygen …