Why one drought is not like another

Tens of thousands of people worldwide are being pushed to the edge of starvation due to drought. In some places, drought conditions are harming wildlife, livestock and straining ecosystems. But not all of these droughts are the same. The World's Host Marco Werman spoke with professor Melinda Smith of Colorado State University about the many different types of droughts, how they affect the environment and why understanding the differences is key to building resilience.