Carbon Monoxide: Natural Sources Dwarf Man's Output

Man releases nearly 270 million tons of carbon monoxide into the atmosphere each year, primarily as a result of incomplete combustion of gasoline in automobiles. Man's CO production is relatively insignificant when considered on a global basis. Natural sources produce more than 3.5 billion tons of CO per year in the Northern Hemisphere alone, or more than 10 times the amount produced by man. 3 references, 1 table.