The City of São Paulo‘s landfill emissions control program is a public-private venture that renovated two of the world‘s largest landfills. Thermoelectric plants are installed at the landfill to collect gas from decaying waste that is then converted to clean energy. It also generates critical revenue through the sale of certified carbon credits that the city then uses to fund development (socio-environmental projects in the landfills‘ surroundings). This landfill project was approved as a United Nations Clean Development Mechanism (CDM) project, making São Paulo one of the only cities to benefit from the carbon finance concept, normally reserved for the national level.