Tech.view
In reference to "Power Struggle" of February 2: You rightly point out that hydrogen is not a source of energy, but a means of transporting it. But then you go on to say "It has to be manufactured—usually by cracking fossil fuels, or by splitting water using electricity. Either process uses a lot of energy, and produces greenhouse gases which get puffed into the atmosphere." Not necessarily. In the US, wind farms in the Dakotas could produce prodigious amounts of electrical energy with virtually no greenhouse gas emissions. Unfortunately, those states are remote from major population centers, and power lines are inefficient transporters of energy over the great distances necessary to get the electricity to say, Chicago. But use the electricity to hydrolyze water and build a pipeline to carry the resulting hydrogen, and you would have perhaps the most efficient method of delivering energy.
Of course, that still leaves the problem of how to carry a respectable amount of hydrogen in a car.
Jerome Fosaaen