Hydrogen fuel cells are nice for the environment. The only waste they produce is water.
So, why aren't they environmentally friendly?
Because you have to make the hydrogen from water in the first place. Fresh water is a very valuable resource.
Thankfully, scientists have now come up with a catalyst that might allow us to generate hydrogen from seawater, which is obviously much more plentiful. Traditional methods generated chlorine, which is bad. This doesn't. (Some chlorine is not bad because we use it for stuff, but this was making way too much).
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