The talk deals with the influences of markets and policies on deforestation in Brazil's Amazon and Cerrado (savanna) regions. Clearing in the Amazon has dropped primarily because of structural economic trends in modernization of agriculture. The savannas are vital, but more threatened. The key goal should be maintenance of ecosystem functions, including hydrological cycles, at the macro-landscape scale. Action requires new knowledge and an eco-social approach. It would be appropriate to launch an initiative to "Save Our Savannas - SOS!" Donald Sawyer is the Lemann Visiting Scholar (2011-2012) at the David Rockefeller Center for Latin American Studies (DRCLAS), Harvard University Donald Sawyer has held several posts at the University of Brasilia where he is currently an Associate Professor and serves as the Vice-Director of the Center for Sustainable Development. His research focuses on the Amazon and Center-West regions. He has coordinated projects funded by foundations, such as the Ford Foundation, MacArthur Foundation, Rockefeller Foundation, the United Nations Development Program and the World Bank, among others. Prof. Sawyer received both his AB and a PhD in Sociology from Harvard University. As the Lemann Visiting Scholar for the 2011 -2012 academic year, he will work on a project entitled 'Eco-Social Governance and Sustainability in Brazil' and collaborate with the Sustainability Science Program at the Harvard Kennedy School, among other parts of Harvard.