Dr. Thomas Karl told EarthSky that the large-scale burning of fossil fuels by humans amounts to treating our planet like a giant laboratory.

Monarch butterflies of eastern and central North America migrate each fall, over great distances, to the same winter homes of their great-great grandparents.

As you sit on the runway, your plane is already moving at the same speed Earth spins because the Earth is rotating.

"To understand any process," said Robin Bell , "you have to understand it from start to end. And what we want to be able to do with ice sheets is actually model how they grow and how they collapse."

Kathy Jacobs told EarthSky that we'll all have to adapt to climate extremes by using water more sustainably. But sustainable water use will mean different things in different places.

Today is the day on which we begin consuming more resources than Earth is producing - and producing more waste than Earth can absorb - for 2009.

Many animals can get as big as their environment and diet allow.

Flames get their "tongue-like" shapes from the way burning gases move and interact under earthly gravity.

The kind of ants you see in your kitchen probably have a few thousand of these "smell cells," and the cells are tuned to different classes of odors.

Larry Mayer, referring to the United Nation’s Law of the Sea, a 27-year-old treaty that allows countries to extend their maritime boundaries - if they back their claim requests with science. To support the U.S. claim, Mayer and his team have mapped more than a million square kilometers of seafloor since 2003.