NEW YORK - A fast-moving snowstorm barreled through the U.S. mid-Atlantic on Tuesday, cancelling flights, snarling roadways and shutting schools and government offices while winds kept the midsection of the country in an icy grip that killed at least 11 people. | Video
RIO DE JANEIRO - Heavy rains late Tuesday and early Wednesday paralyzed much of Rio de Janeiro, a tropical metropolis scrambling to improve infrastructure to prepare to host the 2014 World Cup and the 2016 Olympics.
WASHINGTON - U.S. Supreme Court justices offered President Barack Obama's administration some encouragement on Tuesday as they weighed the lawfulness of a federal regulation limiting air pollution that crosses state lines, mostly emissions from coal-fired power plants.
RENO, Nevada - A couple and four young children missing in frigid weather since they went on an outing to play in the snow on Sunday were found alive in a remote mountain range in Nevada on Tuesday huddled in their overturned vehicle, a sheriff's dispatch supervisor said.
WASHINGTON - The U.S. environmental regulator argued in court on Tuesday that its rule limiting mercury and hazardous air pollutants is "appropriate and necessary," not an improper interpretation of the federal Clean Air Act as industry groups and some states contend.
- Two former BP Plc supervisors won the dismissal on Tuesday of some of the manslaughter charges facing them over the Gulf of Mexico drilling rig explosion that killed 11 people in 2010.
BEIJING - Commentaries by two of China's most influential news outlets suggesting that the country's air pollution crisis was not without a silver lining drew a withering reaction on Tuesday from internet users and other media.
SAN FRANCISCO - The Arctic air blasting the eastern United States is positively balmy compared to the record minus 136 degrees Fahrenheit (minus 93 degrees Celsius) temperature measured in Antarctica in August 2010, according to research released on Monday.
SACRAMENTO, California - California pledged on Monday to restore 80,000 acres of the depleted Sacramento-San Joaquin River Delta as part of a massive project to send fresh water from mountain streams in the north to farmers and residents in the parched south.
WASHINGTON - Eight Northeastern and mid-Atlantic governors on Monday petitioned the U.S. Environmental Protection Agency to require "upwind" states in the Midwest and South to curb ozone-forming pollution from their power plants, which they say travels downwind and poses health risks to their citizens.