The hottest artists to appear at Tramlines Festival have all pledged to do their bit to tackle climate change.
Europe's biggest free music festival saw 125,000 people flock to Sheffield to see acts including Tinchy Stryder, Echo and the Bunnymen, Richard Hawley, Dane Bowers, The Hoosiers, Professor Green and Skepta.
From going veggie to wearing vintage clothes, check out how the celebs have promised to do their bit!