ii. April 22 is the 45th anniversary of Earth Day. This year's theme is "It's Our Turn to Lead."
iii. It was first celebrated in 1970, Earth Day is being observed in more than 192 countries today.
iv. More than one billion people participate in Earth Day campaigns every year and it is the largest civic event in the world, celebrated simultaneously around the globe by people of all nationalities, faiths and backgrounds.