The carbon market mechanisms (emission exchange, Clean Development Mechanisms (CDM), Reduction of Emissions from Deforestation and Forest Degradation (REDD+) and voluntary markets) are considered as one of the means to reduce climate change and other environmental issues. The carbon (C) market is conducted through the captions of cap-and-trade or credit schemes that finance or offset Greenhouse Gas (GHG) reductions. This module introduces the principles and concepts of C stock estimation, C trading, payments for environmental services, C trading processes and agreements, C stock estimation methods, methodological questions about C market and trading, C market risks and opportunities, global, regional and national marketing.