
The recent phenomena on Earth like climate change, melting polar iceberg and higher sea level are the results from the human’s consumption of energy produced by fossil fuel such as oil and coal in the recent centuries. During the said energy production, carbon dioxide (CO2) is continuously emitted to the atmosphere, compounding with other gases and becoming the greenhouse gases covering the Earth like a giant blanket. These gases cause the global warming which is the reason behind the aforementioned phenomena.
With the attempt to prevent further damage from global warming, the Conference of Parties to the United Nations Framework Convention on Climate Change (UNFCCC) eventually adopted the Kyoto Protocol in 1997. The Protocol binds the countries in Annex I (there are 34 counties, most of them are developed countries) with the commitment to reduce the emission of greenhouse gases by around 5% from the 1990 level. Thailand is not listed in Annex I, so it does not have to follow the said commitment. However, greenhouse-gas emission in the developed countries costs highly. Kyoto Protocol, then, initiated the Clean Development Mechanism (CDM) to allow the countries in Annex I to cooperate with other developing countries to reduce the greenhouse gases emission as it costs much less in the latter. This cooperation is operated with the method called “Carbon Credit.”
Note: greenhouse gases comprise six gases, namely, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), hydrofluorocarbons (HFC), perfluorocarbons (PFC) and sulphur hexafluoride (SF6)
The projects that can be qualified as CDM project are the projects which practically decrease greenhouse-gases emission and the result must be measurable. Also, these projects must support the sustainable development in Thailand. The examples of some projects with qualified characteristics are as follows:

The CDM project is divided into two phases as follows:
1.1 Project feasibility study
1.2 Project Idea Note or PIN
1.3 Project Design Document or PDD
1.4 Project proposal for approval from designated national authority (DNA). Thailand’s DNA is the Office of Environmental Policy and Planning
1.5 Project validation and evaluation by independent validators
1.6 Registration with the Executive Board (EB) of UNFCCC
The processes in this phase are conducted once only.
2.1 Project performance monitoring
2.2 Project verification and certification
2.3 Issue of Certified Emission Reductions (CERs) by the Executive Board
The processes in this phase are annually conducted.
The projects joining CDM project will earn the income from the sale of their annual emitted-carbon. The carbon trade is made in the form of CERs with the trade unit expressed in carbon dioxide equivalent (CO2e). There are two kinds of CERs trade terms which are (1) seven-year term, renewable twice and (2) ten-year term.
During project development:
During project operation:
