Another very bad idea that never goes away.

[NNadir]

3. Well, like hydrogen itself, it's a thermodynamic nightmare.

It's also a prescription for the formation of nitrogen oxides, and as stated earlier for the degradation of water supplies through eutrophication.

It is, in my view, possible to produce hydrogen by exergy capture rather than exergy destruction, as is practiced now, but this is only achievable with very high temperature systems, only available with nuclear energy. In this case, the means to address hydrogen's horrible and dangerous physical properties, which make it useless for consumer purposes is to hydrogenate carbon dioxide, preferably to form DME, which has a high critical temperature, is non corrosive and can drop in to replace all uses of all dangerous fossil fuels using existing infrastructure. It's atmospheric half life is about 5 days and it's nontoxic. The major current industrial use for DME is as a propellant in hair spray cans.

However this technology has not been developed industrially, DME from nuclear energy, although it is well known on pilot and lab scales.