From the study will see that if Thailand want to reducing carbon dioxide down. Should focus on reducing emissions from the electricity sector. Non-metallic sector and transportation sector because it is a three economic sectors, with carbon dioxide emissions high. And from the study also found that the three sector has a lot of carbon dioxide emissions is coal, petroleum refinery and natural gas. Therefore, if Thailand want to reducing carbon dioxide down should be decrease amount consumption of coal, petroleum refinery and natural gas or the policy for renewable fuels with high carbon dioxide emissions instead.