Happy Earth Day!

As Elizabeth posted on Monday, today is Earth Day! Nearly 20 million Americans participated in the first Earth Day celebration on April 22, 1970. Since then, Earth Day has spread around the world with thousands of events in more than 180 countries.

Last Sunday, 100,000 people attended Earth Day on the National Mall in Washington, DC. Speakers and entertainers included Secretary of Labor Hilda Solis, EPA Administrator Lisa Jackson, Representative Edward Markey, and rock bands The Flaming Lips and Los Lobos.

Today President Obama is addressing plans for energy and green jobs in Iowa.

So what are you going to do today? Find an event in your area and do something!

To start, there's a cool photo project run by Earth Mosaic that will plot photos from around the globe on a map. Click here for more information. For more events, look at Elizabeth's blog post.