A significant amount of coal is burned in the world today. Much of it is burned in an inefficient way. Retrofitting coal burning plants to burn cleaner would a

A significant amount of coal is burned in the world today. Much of it is burned in an inefficient way. Retrofitting coal burning plants to burn cleaner would a large impact on global carbon emissions. Replacing coal with cleaner sources would also have a large impact. The important thing is: dollar-for-dollar, retrofitting is more effective than replacing.