Earth Day was founded in 1970 following a 1969 Santa Barbara oil spill. But its meaning has changed today. Here's why you should just plant a tree.

Millions of people around the world will pause, at least for a moment, to mark Earth Day. The annual event is Wednesday.

But it was a senator from Wisconsin, Democrat Gaylord Nelson, who had the idea that would become Earth Day. Nelson had long ...

Earth Day was created in 1970 to raise awareness for environmental issues, leading to the passage of environmental protection ...

Here's what to know about Earth Day 2026 and how the holiday came to be.

It's been more than 50 years since the first Earth Day in the United States. On April 22, 1970, people gathered at events across the country to raise awareness about the environmental issues impacting ...

Earth Day often inspires communities to come together through volunteer work, and 2026 won't be much different.

An Earth Day poster created by artist Mary Lynn Hartwell and her roommate Susan Palmer in 1970 is recognized by Penn State ...

From its 1970 origins to today's climate action, here's why Earth Day is observed each April 22 and what the day represents.

Earth Day is a celebration that comes at a time when climate change is affecting communities across the globe. Earth Day, ...

Earth Day is April 22. Here's what to know about how Earth Day happened and how to celebrate our planet this April.