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SACRAMENTO -- California regulators are pushing back their first-in-the-nation greenhouse gas trading system by one year to insulate it from potential market manipulation, the head of the state's air agency said yesterday. What was originally intended to be a routine legislative hearing on the status of California's cap-and-trade system became instead a pivotal moment in the state's climate policy, with a standing-room crowd hanging on Air Resources Board (ARB) Chairwoman Mary Nichols' every word

Earlier this month, scientists for the Pan African Sanctuaries Alliance presented new research that predicted the extinction of the Nigeria-Cameroon chimpanzee ( Pan troglodytes ellioti ), the world's rarest chimpanzee subspecies, within as little as 20 years.

For most women, having kids means new responsibilities and a shift in priorities. What moms don't realize is how kids physically change their brain. Scientific American brings you a quick tour of the female brain under the influence--of offspring

By Ari Rabinovitch JERUSALEM (Reuters) - Israel wants to harvest salt from the bottom of the Dead Sea in hopes of protecting its southern shore, but a $2 billion price tag has pitted the government against one of the country's largest companies.

By Ari Rabinovitch JERUSALEM (Reuters) - Israel wants to harvest salt from the bottom of the Dead Sea in hopes of protecting its southern shore, but a $2 billion price tag has pitted the government against one of the country's largest companies.

The evidence is in: global warming has caused severe floods, droughts and storms. We present a three-part series by John Carey, who was funded by the Pew Center on Global Climate Change, and other selections from the editors [More]

My frail, 92-year-old mother was prescribed 80 mgs of the cholesterol-lowering drug, or statin, simvastatin for years. She fell four times in the last four years of her life: the last fall was the least forgiving.

Editor's note: This article is the last of a three-part series by John Carey. Part 1, " Storm Warning: Extreme Weather Is Caused by Climate Change ," was posted on June 28.

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Twenty-five years after the tragedy at the Chernobyl power plant in Ukraine, tons of concrete shield workers and visitors from the puddle of dangerously radioactive melted fuel that lurks in the basement. In contrast, more than 30 years after the accident at Three Mile Island near Harrisburg, Pa., the next-door twin of the partially melted-down reactor is still in operation and surrounded by homes.

When the AIDS epidemic first surfaced in the U.S.

Each year, human civilization consumes some 14 terawatts of power, mostly provided by burning the fossilized sunshine known as coal, oil and natural gas. That's 2,000 watts for every man, woman and child on the planet

By Kate Kelland and Eric Kelsey LONDON/BERLIN (Reuters) - Imported fenugreek seeds from Egypt may be the source of highly toxic E. coli outbreaks in Germany and France that have killed at least 48 people, according to initial investigations by European scientists

By Kate Kelland and Eric Kelsey LONDON/BERLIN (Reuters) - Imported fenugreek seeds from Egypt may be the source of highly toxic E. coli outbreaks in Germany and France that have killed at least 48 people, according to initial investigations by European scientists. [More]

LINDAU, Germany--A vaccine to prevent infections of cancer-causing human papilloma virus (HPV) is currently approved for use in the U.S. in boys and girls and in the UK in girls.