| Annual eco-friendly celebration |
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| *Insufficiency |
Newsday |
09 May 2025 |
| Spring celebration |
Thomas Joseph |
21 Apr 2025 |
| April celebration |
Eugene Sheffer |
07 Oct 2024 |
| Annual event on April 22 to demonstrate support for environmental protection |
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| April celebration |
Eugene Sheffer |
05 Jun 2024 |
| Environmentally-focused event on April 22 |
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| Event first observed in 1970 |
New York Times |
16 Feb 2023 |
| Environmentalist's annual observance |
USA Today |
17 Nov 2020 |
| Observance first celebrated in 1970 |
New York Times |
10 May 2020 |
| Spring celebration |
Thomas Joseph |
22 Apr 2020 |
| April 22 |
New York Times |
12 Apr 2020 |
| April event that's "green" |
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| Environmental observance |
Thomas Joseph |
06 Jan 2020 |
| April celebration |
Eugene Sheffer |
01 Nov 2019 |
| *Scarcity |
New York Times |
07 Aug 2019 |
| *Scarcity |
Universal |
12 Apr 2019 |
| *Scarcity |
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| *Scarcity |
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| Annual "green" event |
USA Today |
24 Jul 2017 |
| Annual "green" event |
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| Annual green event |
Eugene Sheffer |
05 Nov 2015 |
| Its flag depicts the Blue Marble |
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| Environmentalists' celebration |
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| Environmentalist's celebration |
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| 4/22 green event |
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| Environmentalists' celebration |
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| Environmentalists' celebration |
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| Environmentalists' celebration |
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| April celebration |
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| April, 1970, happening |
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| April, 1970, event |
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