Ron Cobb created an ecology symbol which he published on November 7, 1969, in the Los Angeles Free Press and then placed it in the public domain.
Flag of the United States | ecology | Ecology | flag | Anti-Flag | Flag of France | Flag of Canada | Raising the Flag on Iwo Jima | Left Ecology Freedom | Flag of Mexico | Flag of Ireland | The Red Flag | Palestinian flag | Flag semaphore | Flag of Turkey | Flag of Indonesia | Blue Flag beach | Black Flag Army | Assassin's Creed IV: Black Flag | 2011 Pan American Games national flag bearers | You're a Grand Old Flag | White Flag (song) | White Flag | International Centre of Insect Physiology and Ecology | Flag of Ulster | flag of the United States | Flag of the United Kingdom | Flag of the Philippines | Flag of South Korea | Flag of Scotland |