Oh I agree that methane is a horrible threat if it is released at massive scale, like from the permafrost. We should absolutely do everything we can to avoid th

Oh I agree that methane is a horrible threat if it is released at massive scale, like from the permafrost. We should absolutely do everything we can to avoid that. My point is that if you compare hydrogen on propulsion equivalent basis and with realistic leakage rates, it is so much better than today's solutions that we should absolutely use it. When it comes to batteries, yeah, that's just not going to happen for anything over 20 passengers and 200 mile operating range. It's physically impossible to obtain sufficient Wh/kg to run even a small airliner on batteries. Airbus is investing heavily in liquid hydrogen fuelled jets, and it's not because they are stupid. > Also, you use a leakage at 1bar then you transpose it to a plane which would obviously not transport the H2 at 1bar but at a much higher pressure. So this part was probably too brief in my first post to be perfectly clear. Imagine that you have the 700 bar pressure tank of the Toyota Mirai, and the entire leakage out to 1 bar (the atmosphere) happens in a single point. Then you put a ballon over that point and measure how quickly it grows. That rate is reported as "2 mL/min at 1 bar".