Brazil's sprawling favelas require long-term urban planning solutions

As Brazilians head to the polls on Sunday for the second round of presidential elections, our correspondents take us to the heart of the country's favelas, where residents live in unsanitary conditions. Over the past 40 years, the area occupied by Brazilian favelas has almost tripled in size. They now cover around 460,000 hectares, compared with 53,700 in 1985.