The other issue is that natural gas (methane) has a higher GHG potential. This assumes leaks in the pipes.
Also assumed is that the 'scrubber technology' is absent or inefficient, which is nonsense. Simple lime treatment will take out ALL SOx, NOx, mercury, particulates etc after the 'water shift reaction'.
This point is ignored which suggests a 'bias' in the authors treatment.
Basically it is IGCC with the gas generation separate from the electricity generation. It COULD be badly done but at least it would fix China's smog problems.