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There was a time when hydrogen powered cars were all the rage in green car circles. They either came with advanced fuel cell electric drivetrains, the most notable being the Honda FCX Clarity and more recent Mercedes-Benz B-Class F-Cell, two models which regular customers could actually lease, or with regular internal combustion engines converted to burn hydrogen instead of gasoline. However, today, hydrogen barely gets a mention, perhaps for good reason. Plug-in hybrids and electric cars, meanwhile, are now usually seen as the most logical option when talking green cars. That doesn’t...