Thermal energy of 1 ton of coal = Thermal energy of 0.6 ton of cruel oil
coal is almost 100% carbon------cruel oil is about 85% carbon --- yield from refining cruel oil about 80%
thermal energy/carbon emission: coal is only 1/2 than of oil
Hyper-critical Coal fed electricity power plant as high as 50%
Energy efficiency of electric motor as high as 90%----Energy efficiency of gasoline motor < 30%
mechanical energy output of electric motor from feeding 1 ton of coal to electric power plant
: mechanical energy output of from feeding 2 ton of cruel oil to refinery then gasoline to gasoline engine
= 50% x 90% : 2 x 30% x 80%
Conclusion: They're about the same relative to carbon emission