The White House urges Congress to avoid the 'sequester' -- with apocolyptic examples of what could happen if it doesn't. Automakers introduce new diesel models for U.S. drivers. Eve Troeh explains how researchers are trying to persuade taxpayers to save, not spend, their refunds. In Eastern China, air pollultion levels have reached historic levels, but Rob Schmitz looks at business opportunities that have actually brightened amid the smog. As the fight over background checks on gun-buyers heats up, David Gura finds out what it really takes to buy a firearm. And as 'Nemo' hits the East Coast, flight attendant Sara Keagle talks about being grounded in the snow.