SInce we're talking climate change I think we should bring back airships for short-haul flights. The fact it floats with little effort means less fuel is needed.
Not to mention for safety reasons these ships would need to use helium and we kind of need to preserve as much of that as we can. It's a non-renewable resource and we need it for lots of science and tech purposes. The fact we still use it for balloons and shit it's mind boggling.