April 22 is Earth Day 2008 for many countries in the Northern Hemisphere. According to the Earth Day Network, the threat of global warming is this year’s theme and events will be held around the world. In celebration, the Green Apple Festival will be held in several cities (with the largest event in Washington D.C.) and use music and other entertainment to celebrate the Earth.

The United Nations celebrates Earth Day on the March equinox, while many countries, including the United States, celebrate Earth Day on April 22. The first Earth Day was held in 1969 at the suggestion of John McConnell and this environmental concern became a significant event as proposed by Senator Gaylord Nelson. On April 22, 1970, 20 million Americans across the U.S. demonstrated for a healthier sustainable environment and represents the arrival of ecological awareness in American society. Earth Day has continued and expanded into a global event, including the use of the Ecology Flag as its symbol: