As per scientists and researchers, carbon dioxide from the sea water can be extracted for making hydro-carbons. The concentration of carbon dioxide in the sea water is 140 times greater than that of air. Carbon dioxide is present as 0.10 gram per liter of sea water. The scientists in the U.S. have demonstrated the ability to recover carbon dioxide and hydrogen from sea water and turn into liquid hydrocarbon fuel.
Recently, scientists at U.S. Naval research laboratory flew a model plane using a liquid hydrocarbon fuel sourced from ocean. Now researchers are going to study that how the conversion of ocean into hydro carbon fuel can be made economically. So it has surely become possible to convert ocean water into fuel. If it is done, it will be very useful and reduce the dependence on fossil fuels.
In order to convert sea water into hydrogen peroxide, scientists have used sunlight. This can produce electricity through fuel cells.