Panel: Abrupt climate change may be bigger threat than larger glacial-pace global warming.
EPA admin says China can learn from U.S. struggles to reduce air pollution.
Scientists were studying images to find out whether a small part of the comet survived encounter with sun.
The huge ice disk likely formed from a combination of cold, dense air and an eddy.
In two decades, the U.N. talks have failed to provide a cure to heat-trapping carbon emissions.
The sun-grazing Comet ISON will either fry and shatter or endure to put on one fabulous celestial show.
The talks aim to work towards a treaty to be signed in 2015 to fight climate change.
A volcanic eruption raised an islet more than 600 feet in diameter in the seas to the far south of Tokyo.
The U.N. Secretary-General says world faces "steep climb" to reach 2015 climate deal.
China's stability-obsessed leadership has become increasingly concerned by the air quality in cities.
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