hydrogen can also be burned to make heat for steam turbines or internal combustion engines. like other synthetic fuels, hydrogen can be created from natural fuels such as coal or natural gas, or from electricity, and therefore represents a valuable addition to the power grid; in the same role as natural gas. such a grid and infrastructure with is now planned by a number of countries including japan, korea and many european countries. this allows these countries to buy less petroleum, which is an economic advantage. the other advantage is that used in a fuel cell or burned in a combustion engine as in a hydrogen car, the motor does not make pollution. only water, and a small amount of nitrogen oxides, forms.