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More than 5 billion tons of carbon dioxide enter the U.S. atmosphere each year. Scientists in Baltimore are studying whether backyards help absorb carbon dioxide, and by so doing, slow the pace of climate change.

The city says it no longer needs the Volunteer Life Saving Corps. Paid lifeguards will take over Sundays and holidays as well as Mondays through Saturdays.

Brea Evans left behind a life in a lab to work as an observer aboard the Alaska Warrior, monitoring what kinds of fish are being caught.

Researchers used drones to study close encounters along the Southern California coast. They surveyed 26 beaches for more than a year with no shark bites reported.

A judge has ruled that the city must put a referendum on the ballot to decide whether volunteer lifeguards can go back to work.

Tropical Depression Seven formed Wednesday morning and is forecast to grow into a tropical storm. After that, wind shear and dry air could keep it from strengthening.

Alastair Fothergill and Mark Linfield are the directors behind the hit nature-documentary series Planet Earth. Their new movie, Earth, uses some of the same footage — but it's "character-based" rather than "habitat based."

City officials are developing a strategic plan to deal with homelessness, and five meetings are scheduled to get the public's opinions.

Warmer air temperatures have triggered the collapse of an enormous ice shelf along the coast of Antarctica, scientists say.

A 7.0 earthquake off the coast of Northern California in early December triggered a tsunami warning for parts of the California and Oregon coasts.