Green scheme for Mexican metropolis

VIDEO: Authorities in Mexico City have taken on the uphill challenge of bringing more bicycles onto the streets of one of the world's largest and most congested cities. Schemes to boost bike use are part of an ambitious 15-year Green Plan which aims to improve the environment of the sprawling metropolis. They're also a pet project for leftist mayor Marcelo Ebrard, who hosts a world meeting of mayors on climate change on Sunday. Duration: 02:01