Earth day is a day set aside to show appreciation to our Earth and make awareness to all of the issues that threaten it.
U.S Senator Gaylor Nelson proposed a bill in 1970 stating that April 22nd be recognized as a national day to celebrate the earth.
However some people celebrate Earth Day on the first day of Spring which is the vernal equinox which occurs on or around March 21st.
It is celebrated in over 175 countries and is coordinated by the non profit Earth Day Network.
The passage of the Clean Air Act, The Clean Water Act and the Endangered Species Act are considered to be products associated with the Earth Day formation in 1970
Some areas even dedicate the whole week during April 22nd to celebrate the Earth.
So to sum it up the basis of Earth Day is to REDUCE, REUSE, RECYCLE, REPLENISH & RESTORE. Beware of the chemicals you use and how you use and dispose of them.
We only have one Earth.