From the beginning, the cloud hanging over the whole hydrogen enterprise has not been the power source as such, but the intractable difficulty of distributing and storing the stuff.
The technique worksbecause when water evaporates at sea, a combination of hydrogen and oxygenisotopes rise to form a cloud, which then releases rain when it moves inland.
这项技术的确有效，因为当水从海中蒸发后，氢和氧的同位素升起形成云，接着当它飘至陆地上空时再变为雨。
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Molecular hydrogen (H2) radiated the heat out of the clouds, so we need to know how much H2 was in the cloud.