We investigate, analytically and through a numerical example using empirical evidence on green-house gas (GHG) emissions, the impact of adopting cleaner technologies within a framework thatconsiders transboundary pollution emissions and where pollution emissions accumulate into a stockand therefore have lasting repercussions on the environment,3two essential features of the GHG emis-sions’ problem. Considering a world made of n countries or regions, we determine the non-cooperativeemissions policies of each region and determine the impact of having all countries simultaneouslyadopt a cleaner technology (captured by a decrease in their emission to output ratio).