Some of the above have particularly savage deleterious health effects. I'm struck by how much damage the particulates can wreak.... and that is why I am an advocate of
UCG-GTL as those processes seem to produce a very clean fuel that can replace diesel with virtually no particulates....
The United States Environmental Protection Agency (EPA) has done a huge job of compiling information and formulating policy... and provides a very useful search tool that can be used to examine my claim that Methane (CSM, LNG) is a much cleaner fuel source than oil and coal....
http://www.epa.gov/search.html