New research suggests it was climate-related drought that built the foundation for the collapse of the Assyrian Empire (whose heartland was based in today’s northern Iraq)—one of the most powerful civilizations in the ancient world.

Buildings use 40 percent of America’s primary energy and 75 percent of its electricity, which can jump to 80 percent when a majority of the population is at home using heating or cooling systems and the seasons reach their extremes.

The ratio of carbon isotopes in three common species of tuna has changed substantially since 2000, suggesting major shifts are taking place in phytoplankton populations that form the base of the ocean’s food web, a new international study finds.

Tropical Storm Fengshen continued to strengthen in the Northwestern Pacific Ocean as NASA’s Terra satellite passed overhead.

The Arctic’s oldest and thickest ice is disappearing at a rate twice as fast as ice in the rest of the region, according to a new study published in the journal Geophysical Research Letters.

The small, dark, round spot in this solar close up is planet Mercury.

A great extinction is under way across most of the planet.

Equilibrium climate sensitivity — how sensitive the Earth's climate is to changes in atmospheric carbon dioxide — may be underestimated in individual climate models, according to a team of climate scientists.

For the first time in the history of space exploration, scientists have measured the seasonal changes in the gases that fill the air directly above the surface of Gale Crater on Mars.

After raising their families in summer, males and females of some bird species spend their winter break apart.