Cadillac unveils a new vision for the future of luxury transportation with the innovative Provoq fuel cell concept - a hydrogen fuel cell crossover vehicle that continues GM's commitment to displace petroleum through advanced technology. The Cadillac Provoq fuel cell concept is the latest example of GM's groundbreaking E-Flex propulsion system, combining the new fifth-generation fuel cell system and a lithium-ion battery to produce an electrically driven vehicle that uses no petroleum and has no emission...