Earth Day 50th Anniversary | Earth Day

Earth Day 50th Anniversary  (Earthday.org)

https://www.earthday.org/earth-day-50th-anniversary/

Earth Day 2020! Celebrate our home planet with these online activities (Mike WALL, Space.com; April 21, 2020)

https://www.space.com/earth-day-2020-home-activities-50th-anniversary.html

Join us April 20-24 for online events celebrating the 50th anniversary of Earth Day! (California Natural Resources Agency)

https://resources.ca.gov/earthday2020