The aim of this paper is to examine how the "Common but Differentiated Responsibility" (CBDR) principle embedded in international climate agreements influences the intensity of corporate tax competition between a developed and a developing country. In contrast to the standard (asymmetric) tax competition literature, our model shows that the interplay between corporate taxes and environmental regulations do not necessarily lead to a higher equilibrium corporate tax in the developed country compared to the developing country. Furthermore, we demonstrate that the developing country does not necessarily become a pollution haven. This finding nuances the argument put forward by developed countries to shrink their climate responsibility that developing countries are pollution havens.