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And on the right is a cryogenic hydrogen aircraft, which is run on liquefied hydrogen. The space shuttle runs on, or ran on, liquefied hydrogen. And the Russians built the Tupolov in the
1980s that ran on this. But it's more mass, more volumous. You need more volume to store the hydrogen. But it weighs less. Because of the lightness of hydrogen.
For heating and cooling, there's air source, and ground source heat pumps. And also solar hot water preheaters. OK. So let's jump then to some statistics.
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