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Yale's William Nordhaus has been running the numbers on Earth's climate troubles. He says charging a fair price for any dumping of carbon dioxide into the air is a cost-effective solution. But at least half the planet must cooperate, his math suggests, or it will be all pain, no gain.

The Bureau of Indian Affairs cost taxpayers $32 million by overpaying for space and renting too much of it. It's just one in a long line of federal leasing problems, according to reports. Health and Human Services has been leasing a building in Maryland for 60 years that it could have owned 10 times over by now.

Carnival in Rio attracts tourists from all over the world. But there is a murky — and sometimes deadly — underbelly to the celebrations. The recent murder of a samba school official highlights the links between the glittering affair that is Carnival and the city's criminal world.

Wildlife groups from around the globe are gathering in London this week, hoping to find ways to slow the trade in rhino horns, elephant tusks and other illegal wildlife products.

American snowboarder Shaun White had hoped to win his third consecutive gold in these games. Instead, he's going home empty-handed. Not a single member of team USA was on the podium for the snowboard halfpipe event.

Chris Christie continues to travel the country as head of the Republican Governors Association. He's promoting the GOP agenda and raising money for this year's elections. But compared to Christie's usual style, it's a low-key tour — absent media interviews and with very few photo ops with smiling candidates.

The U.S. government has announced new restrictions in the trade of African elephant ivory. Imports and exports are banned and sales are limited to antiques at least 100 years old. It's part of a broader effort to protect elephants and other animals from escalating illegal wildlife trade.

Community College leaders are in Washington lobbying for more money and a bigger role in training Americans for the workforce. In most states though, community college funding has been slashed. It's unclear if the schools can open their doors to more people or create new job-training programs.

Less than a week after CVS announced it would no longer sell tobacco products, its stock is on the rise.

The National Weather Service is not holding back on its warnings about the ice and snowstorm that is hitting the Deep South and will move into the Mid-Atlantic later Wednesday. Forecasters warn of "impossible travel conditions" in Georgia and dangerous roads elsewhere. Thousands are without power.