A diffident, fearful flyer, acutely conscious of the damage that the modern aviation industry does to the climate, in 2023 Christopher confronted his bugbear and embarked on an investigation into the efforts of this hard-to-abate industry to wean itself off its reliance on fossil fuels. In this perky but clear-eyed account, Christopher meets the inventors, visionaries and entrepreneurs who are at the frontier of the new technologies, from a European start-up that makes fuel out of thin air to a California firm using electricity to power an electrical take off and landing vehicle ('the offspring of a suppository and a golf trolley with a V-tail like a hunchback whale') and an airship called the Flying Whale.