Apr 21, 2021 Earth Day is a vital milestone to reflect on the planet and iHeartRadio is happy to highlight the celebrities that have used their platform to stress the importance of prioritizing our world. Whether it's been through environmental work, special appearances or even music, a number of stars have made it clear that no one is too important to do their part and preach some love for our planet. Scroll on below to see how stars like Leonardo DiCaprio, Beyoncé, Miley Cyrus and more are involved in raising awareness about Earth's needs. 1. Zac Efron Zac, a member of the Global Advisory Committee, will front Discovery’s