3.4.1 Climate change is mitigated by reducing emissions that increase atmospheric concentrations of CO2 and other green- house gases. This Strategy and the ensuing 10 year Transport Master Plans will need to direct transport onto a less carbon intensive path by encouraging travel by more sustainable modes. Modes which are low or zero carbon options such as walking and cycling are particularly important, and have the added impact of contributing to the overall carbon efficiency of all modes. While the contributions of air and maritime travel to green-house gas emissions are a global issue, there is need to continue to ensure that efforts are made to minimise the impact while taking developmental considerations into account.