What would it take to decarbonise the global economy?

FROM BEHIND the wheel of a self-driving electric Tesla model S, gliding amid the forests and fjords of Norway, the future of the planet looks pretty good. It almost feels as if you are on the road, hands-free, to a post-fossil-fuel future. Virtually all of Norway’s electricity is emissions-free. It comes from hydropower delivered by cascading waterfalls, dams and rivers that run so close to the roads that you can almost run your fingers through them. There are so many fast-charging stations that you are unlikely to get stranded. Teslas have become so run-of-the-mill in Oslo that it is not unusual to see them spattered with mud, their seats matted with dog hair.