Introduction
Increasingly convincing evidence shows that the earth is getting warmer and in the future warming could have serious effects on humans (Mann et al., 1998).
The atmospheric concentration of carbon dioxide (CO2), the primary and best studied greenhouse gas, has increased by about 30 % from the start of the industrial revolution till 1992 due to fossil fuel combustion and changes in land use
(Mark and Thomas, 2001).
The ultimate objective of The United Nations Framework, of which Thailand is a member, is to stabilize atmospheric greenhouse gas concentrations at a level that will not cause dangerous anthropogenic interference with the climate system.
The reduction in emission of greenhouse gases by member industrialized countries was called for at the Kyoto Protocol.
Thailand has ratified the Kyoto Protocol since August 28, 2002; therefore, the country will voluntarily participate in CO2 reduction.
There are two alternatives to reduce CO2: decreasing carbon sources and increasing carbon sinks.