But nobody in Durban at the UN climate change talks wanted to douse the enthusiasm of one Muftah Elarbash from the Libyan delegation.

His country’s transitional government apparently has a $45trn plan that would not just cool the Earth by 6°C but reverse global warming and provide power for two billion people.

Problem solved, you might think, until you get into the detail of building 50 or so 15km-wide “venting towers” to create constant winds in the desert to drive massive wind farms that would send electricity around the world.

In