Making flying more energy efficient – possibly and in the future

One of the stories that crept under my personal radar a couple of week ago related to aircraft engines. Aircrafts account of 2% of the greenhouse gas emissions. The impact of this figure is thought to be higher because the emissions are expelled at height, where they can do the most absorption of light energy. Further aircraft expel vapour trials which are thought to have an effect on the amount of light reaching the surface of the planet by dimming it. So it is possible, but not completely proved, that flying gives us the worst of all possible worlds – heating the air and dimming the surface. Continue reading