What are you doing on Saturday 24 March at 8.30pm? ‘Getting hammered in Clapham.’

OK, if you could perhaps tweak those plans, please, it would be much appreciated.

That’s because that specific time marks the start of Earth Hour, the brainchild of the World Wide Fund for Nature.

It’s where millions of people, businesses, schools and landmarks unite to switch off the electricity for a full hour as a symbol of solidarity for planet Earth.

The WWF also wants everyone to make a #PromiseForThePlanet; that could mean finally buying that reusable coffee cup, becoming a flexitarian or switching to a greener energy supplier.

For more information, visit Earth Hour and, whatever you do, remember to turn off those lights. Unless, of course, you’re driving.

Read more: How to use less plastic