Hey!--What's all this guff about "clean burning coal"? There is no such beast. Any engineer will tell you that the main measure of combustion efficiency with respect to carbonaceaous fuels is in analysis of the "flue gases". And the higher the figure for carbon dioxide, the happier will everyone be---except those who are concerned about greenhouse gases, that is! Finding a way to capture and confining carbon dioxide is the ONLY way to making "clean burning coal" a credible expression.