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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.
The end-use power demand today is about 12 and a half terawatts. That's for all purposes.
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