I’m writing to encourage your readers to join the thousands of people across the UK and millions across the world taking part in the biggest event to protect the planet, WWF’s Earth Hour, taking place at 8.30pm on Saturday March 24.

This year, make a #PromiseForThePlanet and change an aspect of your life to live more sustainably. This could be switching to a green energy provider, refusing plastic cutlery with take-away food or buying a reusable coffee cup.

With almost half of animal and plant species at risk in the world’s most important natural places if global temperatures continue to rise at the current rate, this year’s Earth Hour is focusing on the need for us all to play a part in protecting our planet.

Make sure you take part and make a promise to protect our wonderful planet at wwf.org.uk/earthhour.

Andy Murray

Tennis player