Have you ever flown over London at night?

Fly over London at night and you realise just how big the city is. Lit
by the sodium streetlights, it is almost all orange except for the
very centre of the city, where the lights from highrise offices turn
the town white and the buildings themselves hide the roadside lamps.

How much power do we consume to light our towns? From the air, it
looks like a lot (particularly in the office blocks), but it's
undeniably striking as you head to Heathrow Airport.

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