In this Tuesday, April 21, 2020, photo, a bird takes off from an Earth globe sculpture at Thea's Park in Tacoma, Wash., with the WestRock Paper Mill in the background. Wednesday is the 50th anniversary of Earth Day, an observance that helped spur activism against air and water pollution and disappearing plants and animals, but ongoing challenges remain throughout the world. (AP Photo/Ted S. Warren)
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