I was curious if aircraft could be fueled feasibly by hydrogen in the future. Okay, I know this has been tried in the past – “Oh, the humanity!” – but, there must be advances in technology since then. 10 minutes of research reveals that battery-powered aircraft are now a going concern, although they tend to be unmanned or at least small. Current fuel cell technology sounds like it has pretty similar limits to batteries. On a larger scale, there is serious research on the potential of liquid hydrogen as a commercial aviation fuel. It sounds feasible but would require major changes in long-lived infrastructure systems around the world. But let’s say you happened to have lots of electricity and water in abundance. Maybe you are in a coastal location and have invested in nuclear power, or you just happen to have lots of geothermal, hydroelectric, or whatever kind of power. You have also invested in desalination and you have created a major transportation hub. You might then be in a position to create liquid hydrogen and/or fuel cells at a cost-effective price. This could be climate friendly as burning hydrogen, in theory at least, creates only water vapor as a product, and fusing hydrogen with atmospheric oxygen creates the same – liquid water or water vapor. Hydrogen is dangerous, but so is jet fuel and so are the materials in modern batteries, so hopefully technology will eventually come to our aid and get the risk and environmental impact down to a similar or lower level than these other options.