- - Observance first celebrated in 1970
- - April 22
- - April event that's "green"
- - April celebration
- - April, 1970, happening
- - April, 1970, event
- - Annual event on April 22 to demonstrate support for environmental protection
- - Environmentalist's annual observance
- - Environmental observance
- - Annual "green" event
- - Its flag depicts the Blue Marble
- - Environmentalists' celebration
- - Environmentalist's celebration
- - 4/22 green event
- - Spring celebration
- - Scarcity.
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