The Environmental Economic Department of the Hungarian University of Economics was the coordinator of the Hungarian Academy of Sciences (MTA) research program, which addressed Hungary’s strategical environmental policy duties in response to the challenge of millennium, mainly in the light of joining the European Union. In this program the MAKK had been requested to draw up a synthesis study which analysed environmental emission taxes. The study summarised the results of previous MAKK research, it also analysed the efficiency of environmental emission taxes (in the economic sense) and its environmental effectiveness compared to alternative economic and environmental policy regulatory instruments (e.g. emission trading). We also conducted further theoretical and empirical research, beyond the synthesis.