Earth Day 2021: What is it and everything you need to know Earth Day is an annual event aimed at tackling climate change THE BIGGEST STORIES ACROSS BRISTOL IN YOUR INBOXInvalid EmailSomething went wrong, please try again later. SIGN UP When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice Today (Thursday, April 22) marks World Earth Day, an annual event aimed at celebrating and promoting environmental campaigning and protection. It has been celebrated on April 22 each year since it was set up in 197, making this the 51st Earth Day.