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by Sarah McFarlane (Wall Street Journal)  BP, Shell want to make the gas using renewable energy, but doing so remains expensive  Big oil companies have long touted hydrogen energy as a way to reduce carbon emissions. Now they are grappling with how to make that a reality. BP BP 3.36% PLC, Royal Dutch Shell RDS.A 3.67% PLC and TotalEnergies SE are all pursuing multimillion-dollar hydrogen projects, often with government support, as they seek to redefine their future role in a world less reliant on fossil fuels. Hydrogen made using renewable energy can be produced and used without emitting carbon dioxide. Still, experts say there are various hurdles to the light, colorless gas fulfilling its potential. Firstly, most hydrogen today is made from fossil fuels, primarily natural gas. The challenge is to make it using renewable power instead and produce it on an industrial scale, in the hope of bringing down costs. Additionally, hydrogen is explosive, as well as difficult

United statesMichael liebreichCameron hepburnLiebreich associatesArcelor mittalUniversity of oxfordEnergy departmentChevron corpCummins incToyota motor north america incHydrogen gainsa toehold in europeMajor energy companies bet big on hydrogenSmith school of enterpriseHydrogen councilSmith schoolToyota motor north america