If you want to understand how Big Oil has changed during one of its most-turbulent eras, just look at the annual strategy outlooks from America's supermajors: Out is growth, and in is saving the climate.Executives from Exxon Mobil Corp. and Chevron Corp. for the first time have put climate friendly, anti-pollution efforts front and center in annual strategy presentations that historically were heavier on talk of barrels, rigs and refining margins.
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