International climate finance aims to address developing countries' needs for mitigation and adaptation funding while meeting targets set in the Copenhagen Accord. Estimates vary but developing countries may need tens to hundreds of billions annually for adaptation alone. The Accord set a goal of $100 billion per year by 2020 from public and private sources to help developing countries take climate action. Mobilizing sufficient finance faces challenges due to economic difficulties in many countries, but opportunities also exist in new climate-related markets and technologies that financial instruments could help support.