ha ha ha ha ha - good one!
Actually, I too have heard that coal can be quite clean burning, especially the coal found in - wait for it - Alberta. With the high tech scrubbers, emissions can be reduced considerably and the coal found in Alberta is somehow different than say the US where it is much "dirtier". I can not, for the life of me remember why that is right now, but apparently there are different "classes" of coal and Alberta has the better one.