As Brazil hopes for yet another World Cup victory, the country is undergoing a major economic shift -- one that includes bold plans for very deep offshore drilling. Speaking with Jeffrey Brown from Rio de Janeiro, Margaret Warner previews her…

As we flew into Rio de Janeiro Wednesday, the city's jagged emerald mountains, sapphire blue waters and ribbon of white beaches seemed as pristine and beautiful as advertised, a natural paradise for residents and vacationers alike. Yet Thursday morning,…