The development of pro-environmental behaviours (PEB) is becoming an on-going and important challenge. Some believe that an efficient way to increase the frequency of PEB is to make the PEB easier by making them more accessible. Others believe that to increase the frequency of PEB, we should develop selfdetermined motivation for PEB. In two studies we examined how self-determined individuals, compared to non self-determined individuals, behave in contexts where PEB were easier or more difficult. Results of Study 1 revealed that (a) the decrease in the frequency of behaviors caused by the behaviors’ difficulty was less important when people were self-determined; (b) the relationships between self-determination and easy, moderate, and difficult PEB displayed a significant relationship with PEB where the magnitude of this relationship significantly increased with each level of difficulty of the PEB. In Study 2, we examined the impact of levels of self-determination and three levels of difficulty for recycling behavior on the amount of recycling when residents were at home and outside their home, as well as the frequency of other PEB. Residents of three municipalities (N=240) that easy, moderate, or difficult access to recycling were compared. Results revealed an interaction between the level of difficulty of recycling when residents were at home and the level of self-determination. For the easy recycling condition, the amount of recyclable for selfdetermined and non self-determined individuals was not significantly different. However, for the moderate and difficult conditions, the amount of recyclable for self-determined and non self-determined individuals became significantly different as the behavior became more difficult. Also, we compared the frequency of other PEB in function of the level of difficulty of recycling and residents' levels of self-determination. Selfdetermined residents for the three municipalities indicated higher frequencies for the other PEB than non self-determined residents. Apparently, making recycling easier did not have a transferable effect on other PEB. In sum, although it is possible to decrease the difficulty of an environmental behavior and then increase its occurrence, it seems that making one behavior easier does not transfer to other PEB. However, behaviors performed out of self-determined reasons lead to higher frequencies of PEB and maintenance of these behaviors once they have been developed.