After spending nearly five years as BP’s first chief sustainability officer, Ivanka Mamic is becoming the first CSO and global head of government relations at Rolls-Royce Holdings. Unlike the oil giant, which did a recent U-turn on low-carbon energy, Rolls-Royce appears committed to embed its climate goals across its strategies, products and research and development. Rolls-Royce, which makes engines for jets including the Boeing 787 Dreamliner, has explored sustainable aviation fuels and ultra-efficient engines. Rolls-Royce is also working on small modular reactors, which the U.K. has chosen for its next generation of nuclear plants. She now brings her experience to Rolls-Royce at a moment of rising geopolitical tensions and decarbonization pressures.