Old growth Douglas fir trees stand along the Salmon river Trail on the Mt. Hood National Forest outside Zigzag, Ore.

Why do we celebrate Earth Day?

Earth Day was first recognized in 1970 as a joint initiative between a Republican and Democrat in Congress.

2:08Animal Kingdom's elephant Mack.

Disney's Animal Kingdom celebrates its 25th anniversary on Earth Day

2:103D installation of the earth, titled "Gaia."

Leaders urge environmental action ahead of 53rd Earth Day

2:51Hand Me Up owners Kara Livingston and Nicole Boynton

Too many kids clothes? Here's one way to cut waste