Here are some Earth Day facts I dug up:
- Earth Day was first observed on April 22, 1970 in Wisconsin. An estimated 20 million people nationwide attended the inaugural event.
- Earth Day 2007 was one of the largest Earth Days to date, with an estimated billion people participating in the proceedings.
- Earth Day is now observed in 175 countries, and coordinated by the Earth Day Network, a nonprofit organization founded by the organizers of the first April 22 Earth Day in 1970.
- In many cities, the Earth Day celebrations are extended to Earth Week, an entire week of activities related to the promotion of activities related to the preservation of Earth. The Earth Week usually start on April 16, and end on Earth Day, April 22nd
200 million: Number of people who celebrated Earth Day in 1990
500 million: Number of people who celebrated Earth Day in 2000
175: Number of countries worldwide that celebrate a designated Earth Day
3.7 billion: World population in 1970
6.7 billion: World population in 2009
65.2 million: Number of Google hits for "Earth Day"
146 million: Number of Google hits for "Green Day"