We mustn’t let the stupidity of the “Climate Change” hoaxers divert us from an objective assessment of emerging technology. Consider the dawn of the airlines. Who, looking at the technology current at that time, could have foreseen the Boeing 707? Along with the commercial advantages of UAVs, autonomous vehicles and stealth capability are attractive enough to our military to generate some serious R&D. I believe advances in metal hydride storage and light-weight fuel cells will eventually make hydrogen-powered electric aircraft commercially viable, to the point where at overhaul time GA aircraft owners will find it advantageous to replace their engines with a drop-in hydrogen power train. Just as it’s been since the dawn of aviation, there will be many failures along the way, but electric motors will replace internal combustion engines in aircraft just as they did in locomotives; there are just too many advantages.