Earth Day is an annual celebration to promote environmental protection and awareness. This year's Earth Day theme, "Our Power, Our Planet," calls for people worldwide to unite behind renewable energy ...

Today is the 55th Earth Day celebrated in the United States.It’s held every year on April 22 — a date originally chosen to fit college students’ schedules. But many may not know how Earth Day began or ...

How did Earth, alone among the solar system's rocky planets, become the home for life? How, among all this frigid lifelessness, did our planet become warm, hospitable, and life-sustaining? The answer ...

Water is essential when it comes to life on Earth, but how exactly it formed on the planet remains a mystery. Past evaluations have proven that the initial days of Earth were too hot to retain ice. At ...

WASHINGTON — Millions of people around the world on Tuesday are celebrating Earth Day, an annual event founded by people who hoped to stir activism to clean up and preserve a planet that is now home ...

From the shores of Lake Tahoe to the bright lights of Reno, communities across Northern Nevada and California are celebrating Earth Day early with festivals, outdoor events and sustainable shopping.

A new study used mathematical formulas and demonstrated that it’s highly unlikely life began on Earth. Instead, the ...