Table 1. List of acronyms used in CDM literature (UNFCCC 2007). Acronym Definition A/R Afforestation and reforestation. A/R AMS Simplified baseline and monitoring methodologies for small-scale afforestation and reforestation project activities under the clean development mechanism. A/R CDM Approved baseline and monitoring methodologies for afforestation and reforestation project activities under the clean development mechanism. CDM Clean development mechanism. CER Certified emissions reductions. GHG Greenhouse gas. LULUCF Land use, land-use change and forestry. PES Payments for environmental services. REDD Reducing emissions from deforestation and forest degradation in developing countries. UNFCCC United Nations Framework Convention on Climate Change.