This paper reviews international agreements related to carbon trading, and examines ASEAN countries’ participation in the Clean Development Mechanism (CDM). It presents information on the forest and energy sectors in Brunei and explores the potential for Brunei’s participation in carbon trading. It concludes that there is considerable potential for greater involvement of ASEAN in general and of Brunei Darussalam in particular and that the revenues from trading could offset higher capital costs of investments in efficiency and renewable energy technologies.