1970 – First Earth Day
1990 – Earth Day goes global (200 million people and 141 countries celebrate)
2000 – A new Millennium (5,000 environmental groups in 184 countries)
2010 – A Billion Acts of Green and The Canopy Project are launched (192 countries)
2020 – 50th anniversary of Earth Day (over 1 billion observers – making it “the largest secular civic event in the world”)