If coal has that effect, then it is a plus for coal. But there are other sources of power that do have that effect: any form of stored energy, nuclear, geotherm

If coal has that effect, then it is a plus for coal. But there are other sources of power that do have that effect: any form of stored energy, nuclear, geothermal, etc... Also note that you can pair energy storage with renewables. It may even spur technological development in these areas. Also the carbon tax taxes unclean energy. Dirty coal would have to pay that tax.