This weekend saw unprecedented worldwide protest on behalf of the environment: the 350 project coordinated activists in 181 countries to call for action on global warming.  Many organizations came together for the actions, including protests in Washington, D.C. and New York City. Rev. Lennox Yearwood, President of the Hip Hop Caucus and co-author with 350's Bill McKibben of the article "People, Let's Get Our Carbon Down" in The Nation, joins us to talk about Saturday's actions, the hip-hop generation's involvement in environmental activism, and his new initiative, Green the Block, with Van Jones and Majora Carter's Green for All.