First fuel-efficiency and greenhouse-gas emissions standards for trucks announced

President Obama announced the first fuel-efficiency and greenhouse gas standards for long-haul rigs, work trucks and other heavy-duty...

Launching a new vision of the L.A. River

The long-awaited Paddle the Los Angeles River pilot program got off to a wobbly start Monday as two dozen civic leaders in hard hats and...

EPA set to miss deadline on ozone rules

The Obama administration, facing withering criticism from industry that environmental rules are behind the stalled economy, appears poised...

Funding is down on California's college farms

The cattle, sheep and horse herds are smaller these days on the 700-acre farm operated by Cal Poly Pomona in the rolling foothills of the...

Hikers are warned of treacherous conditions in Eaton Canyon

Heavy crowds and treacherous terrain have proved a dangerous combination this summer in the popular Eaton Canyon section of Angeles National...

Tattered economy has a silver lining for conservationists

The news is distressing: A cratering real estate market, tight-fisted banks unwilling to make loans and no appetite among elected...

Baruj Benacerraf dies at 90; Nobelist made key discoveries about immune system

Dr. Baruj Benacerraf, who shared the 1980 Nobel Prize in physiology or medicine for his pioneering work explaining why some people are...

NASA's Juno explorer launches on five-year journey to Jupiter

NASA's spacecraft Juno lifted off Friday in an incandescent arc over the Atlantic Ocean, the start of a five-year, 1.7-billion mile trip...

Space travel: Finding the technology to traverse the stars

What will it take to build a spaceship capable of traveling to the stars? And what if you wanted it to be ready to launch in just 100 years?

Shell gets conditional approval for U.S. Arctic drilling plan

Shell Exploration was conditionally cleared Thursday to proceed with the most ambitious oil and gas drilling program ever attempted in the...

Vampire bats' 'thermostat' helps them find ripe prey, study finds

Vampire bats like it warm: To home in and bite with fanged efficiency, they've developed a temperature sensor to guide them to their prey, a...

Salty water may flow on Mars, images suggest

Salty water may flow on Mars in the form of strange, dark lines on the terrain that grow and fade with the seasons, according to recent...

Nigeria oil spills have created ecological disaster, report says

After half a century of oil spills, Nigeria's troubled Niger Delta is one of the most polluted places on Earth, and it could take $1 billion...

Forecasters predict unusually active hurricane season

Exceptionally warm ocean waters and favorable atmospheric conditions are expected to bring an above-average number of tropical storms and...

John Marburger III dies at 70; science advisor to President George W. Bush

Physicist John H. Marburger III, who served as President George W. Bush's science advisor at a time when most researchers considered science...