Carbon credits are permits that allow entities to emit one tonne of carbon dioxide. They are a key part of international attempts to mitigate greenhouse gas emissions. Under the Kyoto Protocol, countries and groups can earn credits by reducing emissions below their quotas, which can then be sold to other entities to offset their emissions. India is the second largest seller of carbon credits globally due to numerous registered clean development mechanism projects. However, Indian companies are hesitant to trade most of the credits they generate due to market uncertainties. One area with potential for credits in India is management of municipal solid waste through conversion to energy.