It's clear there's a power struggle going on at this year's Detroit show: It's a battle between the big trucks and eco rides. But soon you can have your cake and eat it, too. General Motors's Chevy Tahoe Hybrid is on offer, but there's also the Cadillac Escalade Hybrid and just this morning GM unveiled the Cadillac Provoq fuel-cell crossover (first on show last week at the Consumer Electronics Show in Las Vegas). The Provoq -- gotta love the name -- looks more ready to go than most "concepts." The Provoq can travel more than 480 km on a fill of hydrogen.