Proven reserves of the world’s top oil companies have fallen by more than 30 percent on average since 2000, with only Exxon and BP showing an improvement, helped by acquisitions, Bernstein said. Meanwhile, more than 1 billion people will urbanize in Asia over the next two decades and this will drive demand for cars, as well as air travel, road freight and plastics that also require oil, according to Bernstein....

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