Nuclear energy could contribute only little to reduce the cause of global warming. Moreover, it can only be a serious option if you shut the eyes to the many cons of nuclear power.
Our energy consumption has increased year by year. Politics and industry made sure that the demand of energy was always fulfilled. Supply followed demand. Sustainability was rarely looked at.
Nuclear power plants are no solution at all. On the contrary, it would mean to shift from one problem (CO2 emission) to another and not less severe problem (nuclear waste, risk of nuclear catastrophes, limited resource uranium, nuclear proliferation).