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Contrails, streaks of cloud created by aircraft, exacerbate global warming. But much of the harm could be avoided by a few small changes to flight paths. Our leader cheers on a scheme to
reduce their damaging effects.
(This article is free to read for non-subscribers.)
Also sky-high and a cause for concern are bond yields. Yesterday America’s government intervened to control its borrowing costs by committing to increase its own purchases of longer-dated debt. Other governments are uneasy too. Bond yields are high in Britain, France, Germany and Japan, to name a few. What has pushed them up? And what (if anything) politicians can do to
bring them down?
Finally Yuval Noah Harari is a big-ideas guy whose tomes tackle broad sweeps of history. Now he is looking to the future. On today’s episode of
The Insider
our editor-in-chief will ask Mr Harari why he believes AIs will come to control civilisation, and what that would mean for humans. Watch from 6pm London time. | 
