Hydrogen fuel cells may not be the faultless fuel panacea we’ve dreamed them to be. As it turns out, mass hydrogen production will result inevitably in a lot of runaway gas which will damage the ozone and create “enigmatic ‘noctilucent clouds’ that would shine at night far above the planet’s surface.”
Now we have to decide whether we prefer greenhouse gases from fossil fuels or sunburns from depleted ozone. All that glitters is not gaseous. Or something disappointing like that.