I remember that April 22 is Earth Day more because it also happens to be our son's birthday - but hey, two reasons to celebrate! While I am not a worshipper of our Earth Mother, I do appreciate this is the only planet and home that we have, so we need to take good care of it not least for practical reasons.
So conserve, recycle, don't litter and enjoy the outdoors.
As Carl Sagan famously wrote in his 1994 book, Pale Blue Dot (inspired by the image of a pixel-sized Earth when seen in a photo from almost 4 billion miles away) -
From this distant vantage point, the Earth might not seem of any particular interest. But for us, it's different. Consider again that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives. The aggregate of our joy and suffering, thousands of confident religions, ideologies, and economic doctrines, every hunter and forager, every hero and coward, every creator and destroyer of civilization, every king and peasant, every young couple in love, every mother and father, hopeful child, inventor and explorer, every teacher of morals, every corrupt politician, every "superstar," every "supreme leader," every saint and sinner in the history of our species lived there – on a mote of dust suspended in a sunbeam.