In The Guardian today George Monbiot urges the world to investigate the possible use of hydrogen-powered airships for long-haul travel more closely.
There's no doubt it's an interesting area, but a lot of people have been pursuing various airship concepts for quite a while now - including the US Navy in quite a big way - and they haven't made a great deal of progress. Putting speed to one side, there really are some serious operational questions about making this practical.
On the other hand, it is the sort of technology that would benefit from some heavier weight research than it has so far had.
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