I always thought the nightmare scenario was hydrogen powered cars. Keeping hydrogen contained while being rattled and banged every day would be a challenge in

I always thought the nightmare scenario was hydrogen powered cars. Keeping hydrogen contained while being rattled and banged every day would be a challenge in the best of scenarios, but some of these cars will end up being be 20 years old, with the absolute minimum spent of maintenance. Now park 1000 of those cars in a multi story parking station, or under a block of housing units.