World Environment Day 2022 The World Environment Day is celebrated on June 5 every year. The day is marked and keep reminding us of the wrong we did to our environment and the right we need to do to correct it all. Let's stop harming nature… Let's join hands to bring a positive change to make planet earth a much healthier, greener and happier place to live. THEME: "ONLY ONE EARTH“ The year 2022 marks the 50th World Environment Day. Sweden is the host this year and the theme is ‘Only One Earth,’ focusing on the need to live sustainably in harmony with nature.