US Pledges $90 Million as World Leaders Tackle Illegal Wildlife Trade

The United States and dozens of other countries have pledged to work together to tackle the illegal wildlife trade and treat it as a serious crime following a conference in London. Trade in endangered wildlife, such as elephant tusks, rhino horns and tiger bones, is worth an estimated $17 billion a year, and it's pushing hundreds of species to the brink of extinction. Henry Ridgwell reports from the conference.