The environmental goods and services liberalization talks in the Doha Round of trade negotiations aim to lower or eliminate tariff and non-tariff barriers to trade in these goods and services. Various proposals have been put forward in the negotiations to define a list of environmental goods. We do not yet have an understanding of the environmental implications of these proposals. This paper aims to define, with as much precision as possible, what the greenhouse gas (GHG) mitigation potential is for the Doha talks on environmental goods. It takes as a point of departure the proposed lists of goods put forward in the negotiations, determining the GHG mitigation potential that might reasonably be expected to result from the increased trade of the goods in question.