Today marks the 40th anniversary of Earth Day. Earth Day was started by Wisconsin Senator Gaylord Nelson who announced there would be a national grassroots demonstration on the preservation of the environment this day, April 22nd. A symbol that grew out of this movement was the Ecology Flag. The flag is an adaptation of the US flag with 13 green and white stripes and a combination of the letters "E" and "O" in the upper left. The "E" and "O" are in reference to "Environment" and "Organism." The symbold happened to resemble the Greek letter theta. The theta was adopted as the official symbol for the flag, warning the public of the impending harm being done to our environment.
To get involved in helping our environment, please visit the Earth Day Network at earthday.org to learn how you can join efforts to help make the planet a healthier place.