This paper discusses the proposal of European Community to introduce a carbon- energy tax with the aim to curb greenhouse gas emissions. Nevertheless the relative successful of this initiative, the volatility of the prices of permits and firms free allocation of permits may undermine the achievement of the emissions permits goals. Therefore,the problem of global warming should be addressed using both quantity and price economic instruments, i.e. that the emission trading scheme should be complemented by a carbon-energy tax. Moreover, it is necesary to move towards a tax on consumption of carbon rather than on carbon production. Finally, environmental federalism could be seen as the direction for implementing the combined system of tax and permits.
Keywords: Carbon-energy tax, Carbon emission trading, Price volatility, Climate change JEL classification: H41; Q53