The holiday remains one of the largest secular observances in the world, used to spotlight ongoing threats including plastic ...

WASHINGTON — Millions of people around the world on Tuesday are celebrating Earth Day, an annual event founded by people who ...

Now celebrating its 55th anniversary, this year's Earth Day theme, "Our Power, Our Planet," calls for people worldwide to ...

Thousands of events are scheduled across the globe to celebrate Earth Day on Tuesday, April 22. Here's a handful happening in ...

Earth Day recognizes the environmental movement. Here's how it started and why it’s still celebrated every April 22.

The first Earth Day is largely credited as one of the key moments that launched the modern environmental movement.

Earth Day helped lead to the formation of the United States Environmental Protection Agency, Clean Air Act, Clean Water Act ...