Online search engine giant Google commemorated Earth Day with an animated doodle, which linked to a specially created quiz on the day. The quiz titled, "Which animal are you?" discerns your personality based on the options selected with the result being the animal matching the quiz taker's nature.
A day to honor the Earth and the concept of peace was first celebrated on March 21, 1970 after peace activist John McConnell proposed it at a UNESCO Conference in San Francisco.
United States Senator Gaylord Nelson found a separate Earth Day a month later the same year on April 22, which has since been held annually in more than 192 countries worldwide to demonstrate support for environmental protection.
Earth Day this year will be marked with innovative campaigns and contests promoting recycling, upcycling, renewables and waste management, and as many as 45 cities in India are gearing up for it. The National Council of Science Museums centre in eastern India will include a competition for students to develop gadgets that run on renewable energies.
Furthermore, NASA is inviting people across the globe to share pictures and videos of their favourite places on Earth using social media - and tag them #NoPlaceLikeHome. (Read more: A must-see 'global selfie')
This year also marks the 45th anniversary of Earth Day
Hollywood star Edward Norton launched Earth Day contest in 2012
"Fight Club" star Edward Norton has launched a new Earth Day contest that offered USD 50,000 to charities. (Read more)