The planet is almost 25,000 miles around and 4.54 billion years old, and humans are still discovering some of the amazing secrets it's hiding.

Earth Day started in the 1970s. Here’s an Earth Day fact everyone should know: Earth Day was first observed on April 22, 1970, followed in 1972 by World Environment Day. It has ...

JACKIE. YEAH. GOOD AFTERNOON. IT’S A REALLY NICE DAY OUT HERE. OF COURSE, WE’VE GOT THE SUN SHINING ON THIS EARTH DAY. A LITTLE BREEZY, SO MY HAIR HAS BEEN KIND OF GOING HERE. THERE AND EVERYWHERE. A ...

Earth Day is one of the most popular and widespread non-religious holidays in the world, recognized in over 100 nations across continents. Although the event was primarily based in the United States, ...

PENNSYLVANIA, USA — In the days, years, and decades ahead of the first Earth Day, Americans were consuming large amounts of gasoline and fossil fuels. Businesses were able to emit plumes of smoke into ...

Earth Day is one of the most popular and widespread nonreligious holidays in the world. Although the event was primarily based in the United States, by 2009 the coordinators for Earth Day helped gain ...

Add Yahoo as a preferred source to see more of our stories on Google. People gather in a park, sitting and standing amidst colorful flags and trees, enjoying a lively outdoor event. Here’s an Earth ...