“the additional initial investment cost to the society would be about 2600 billion dollars and there will be a CO2 reduction of about 0.5 billion tons per year. For comparison, if all the existing coal plants were replaced with natural gas plants in the United States, the additional cost to the society would only be about 220 billion dollars and correspondingly there would also be a reduction of about 0.5 billion tons of CO2 per year.”