As an international climate conference opens in Copenhagen, the United States says greenhouse gases blamed for global warming should be regulated as a health hazard. The announcement comes as delegates from 192 nations call on leaders to take stronger action to save the Earth. President Barack Obama, meanwhile, meets with Al Gore at the White House.
The Point: Summit by the Numbers | Also See: 10 Surprising Effects of Warming

The FBI joins the search for an Italian chef missing from a cruise ship. Investigators say Angelo Faliva, 31, has not been seen since Nov. 26, when the Coral Princess was sailing from Aruba to Colombia. Officials say Faliva may have gone overboard during the Caribbean cruise. His family says if that's the case, there must have been foul play.

A powerful snowstorm socks the Western U.S., snarling traffic and closing schools across the region. Washington state is shivering through subzero wind chill temperatures, while forecasters predict up to 2 feet of snow around Flagstaff, Ariz.

As the Tea Party Movement prepares to host its first convention in February, a struggle is under way to heal internal rifts and clarify the sometimes disparate message of its many sub-groups. Some observers say that for the group to have a long-term impact, it needs to coalesce behind a single leader.

Three Missouri schools complain about a recent shipment of pencils and notebooks -- whose logos resemble one used by Barack Obama during his presidential campaign. "I don't want to get into that political arena at all," says one school principal. The supplier, Pencils Wholesale, says the design was an accident. It is recalling the items.

The Supreme Court agrees to hear arguments on whether a California law school violated the constitutional rights of a Christian group by denying it recognition as an official campus organization because it excludes gays and lesbians. Federal courts have ruled against the Christian Legal Society's claims to freedom of religion and association.

A Chicago man is accused of aiding in the terror strikes in the Indian city of Mumbai that killed 166 people. David Coleman Headley, an American, is accused of conducting surveillance on potential targets in Mumbai before last year's attacks. He was earlier accused of planning an attack on a Danish newspaper that published caricatures of the Prophet Muhammad.

A Polish historian studying a 1918 book of death records comes across a death certificate for the World War 1 German flying ace Manfred von Richthofen. But the document sheds no new light on a decades-old debate: Who shot down the pilot, known as the "Red Baron"?