Do you consider yourself an environmentalist? A planet protector? A tree-hugging, composting, reusable-straw-carrying warrior of sustainability? Well, it’s time to put your environmental street cred ...

Add Yahoo as a preferred source to see more of our stories on Google. Happy Earth Day! For the 55th year, the world is using the day to celebrate Mother Nature and the wonderful planet we live on.

Do you remember the meaning of the first Earth Day? How big was it? What about the time in history made it come together? I ...

Millions of people around the world will pause on Tuesday, at least for a moment, to mark Earth Day. It's an annual event founded by people who hoped to stir activism to clean up and preserve a planet ...

Earth Day and Arbor Day will be celebrated with eco-friendly community festivals that foster care of the planet ...

Get involved by planting trees or picking up litter in your neighborhood or registering to vote. There are a lot of options ...

When you think about our origin story, and of our planet -- among all of the planets in the cosmos -- there is a deep ...

The following are excerpts from a speech given by Former Senator Gaylord Nelson to the Catalyst Conference in Illinois in ...