The abundance of CO2 makes seawater look like a good alternative fuel source. Scientists at the U.S. Naval Research Laboratory said that, "although the gas forms only a small proportion of air – around 0.04 per cent – ocean water contains about 140 times that concentration". However this often-repeated statement is misleading because while the density of CO2 and related compounds in seawater is about 200x the density of CO2 in air on a per cubic meter basis, carbon dioxide compounds are only about 1/4 the density on a per kg basis.