Arbor Day Foundation's Tree Cities of the World

<p>Cities make up just three percent of the planet's surface, but they're home to nearly 60 percent of the world's population who consume 75 percent of natural resources. So, it’s helpful that they contribute to taking in carbon dioxide and supplying oxygen.  The Arbor Day Foundation recently announced the first cities which are part of its ‘Tree Cities of the World’ program and we’re joined by Pete Smith, the foundation’s Urban Forestry Program manager.</p>