I was amused by other color coding for hydrogen, especially "turquoise hydrogen": hydrogen that is produced by pyrolysis of methane to hydrogen and carbon. This requires considerably less energy than conversion of water to hydrogen and oxygen. The carbon can then be buried so it doesn't oxidize.

The name comes from the combination of "green hydrogen" (electrolysis using non-fossil electricity) and "blue hydrogen" (methane reforming that avoids CO2 emission by capture and sequestration of the CO2).

Absolutely. But it is also helpful to for example subsidize low carbon energy, rather than solar and hydro specifically, because it allows for innovations outside of those specific options.