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there isn't one solution to our environment and energy crisis. That is the thinking which says 'solar is a meme', 'hydrogen is a meme', they're not memes, they can't be widely applied, they won't wholly fix anything alone and they're prone to be overhyped by both vested interests and cynical detractors.
Hydrogen is useful in specific circumstances. It's technology that is worth using and developing, within reason, and it will help reduce fossil fuel dependence, to a small extent.
