Karl Ritter

A Russian fighter jet on Tuesday struck the propeller of a U.S. surveillance drone over the Black Sea, causing American forces to bring down the unmanned vehicle in international waters, the U.S. military said.

With only hours left to produce a global climate accord, rifts emerged Friday between Western countries and China and its allies over who should bear the most burden in reducing emissions and helping vulnerable nations cope with the rising seas and extreme weather that comes with global warming.

Two American researchers won the Nobel Prize in chemistry Wednesday for studies of protein receptors that let body cells sense and respond to outside signals like danger or the flavor of food. Such studies are key for developing better drugs.

Nobel prize goes to Briton, Japanese for stem cell work

Employing the same daredevil tactics it has used against commercial whaling and nuclear testing, Greenpeace is dead-set on preventing oil companies from profiting from global warming by drilling for oil near the Arctic's shrinking ice cap.