Mar 29: Will Mexico let in foreign oil money?

National oil company, Pemex, struggles as production falls. The Cantarell oil field in Mexico, one of the world’s largest, has been producing less oil for the last few years. Carola Hoyos, chief energy correspondent, travels to Mexico to find out what the national oil company Pemex is doing to counter Cantarell’s decline, and what challenges lie ahead. Filmed and produced by Deborah Bonello.