Why is it so hot at the moment?
Media playback is unsupported on your device

UK heatwave 2018: Why is it so hot?

Want to know why you've had sleepless nights for weeks on end?

The BBC's Science Editor David Shukman looks at why there have been a number of heatwaves across the world.

Produced by Emily Wolstencroft

  • 26 Jul 2018
Go to next video: Violence as HK protesters try to leave university