This is a long post, around 5,000 words, wherein I go down many rabbit holes. Perhaps at the end, though, there is a little pot of genuine climate gold.

At any given time there are more than half a million people in the sky, a veritable city about 11 kilometres up, strapped into seats in pressurised tubes atop gigantic flying tanks of kerosene. Looking forward, numbers of air travellers are increasing by 5% each year. Continue reading Too good to be true? Is green flying really possible? →