What is Earth Day and why is it celebrated on April 22?
Earth Day is marked across the globe on April 22 to support environmental conservation efforts.
Leaders from 196 nations came together on April 22 that year to adopt a legally binding treaty against global warming.
The annual event is being marked on Monday with the global theme ‘Planet vs. Plastics’.
According to the earthday.org website, Hayes eventually built a national staff of 85 to promote events across the land. They also changed the name of the event to Earth Day to garner greater visibility.