Royal Dutch Shell gave a presentation in Houston of the advances it has made to produce liquid fuel from waste and inedible crops, crediting the Renewable Fuel Standard for the industry's growth. "We would not be where we are today, even having this conversation, were it not for the RFS," said Matthew Tipper, Shell's vice president for alternative energies. The RFS "sent out a very clear signal that the U.S. was serious about developing advanced biofuels," he said.

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