This document provides an overview of carbon finance and the World Bank's Carbon Finance Business. It discusses the costs of climate change and mitigation efforts, international responses to climate change including the Kyoto Protocol, and how the World Bank works to facilitate carbon market projects through carbon funds. The World Bank manages over $2 billion for carbon finance projects focused on energy efficiency, industrial emissions, and reforestation. The funds provide upfront financing to developing countries in exchange for verified emissions reductions.