Earth Day celebration was proposed at a UNESCO conference in 1969 by peace activist John McConnell in honour of the earth and as a concept of peace. It was later sanctioned and signed by General U Thant, and Senator Gaylord Nelson proposed the idea to celebrate it every year on April 22. Wishing everyone a Happy Earth Day 2023! Earth Day 2023 Images & HD Wallpapers For Free Download Online: Wish Happy Earth Day With Quotes, WhatsApp Status, Facebook Greetings and GIFs.