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A new conversion process promises zero carbon emissions during production—but some question whether it will scale.
Alternative approaches replace the battery with compressed air or a flywheel.
Proton OnSite’s lack of progress toward its proposed “hydrogen highway” demonstrates the low priority America gives this alternative fuel.
A GM-funded bus could reduce transit agencies’ fuel bills by 80 percent.
A startup moves toward thin-film solid-oxide fuel cells suitable for practical devices.
Dedicated lines are the key to record-breaking speeds.
The all-electric car will tell drivers where to recharge.