Where are the hydrogen deposits we will use for hydrogen-powered cars to fight global warming?

Hydrogen is found in our oceans locked with oxygen as water. So I guess you could say the Pacific and Atlantic oceans are our two largest deposits of hydrogen. Extraction is done by passing a current through the water and separating the hydrogen and oxygen. The advantage here is that it is relatively easy to turn any electricity into fuel that can be stored. Electricity is an energy form that is not cheaply or easily storable, while hydrogen is not as easy as petroleum products to store it is cheaper than electricity. The other main advantage to hydrogen is that when it combusts it returns to water. Of course what a lot of people fail to realize is that one of the most common and strongest of the green house gasses is water vapor. Of course if they admitted that then they’d have to admit that CO2 is a very minor component of global warming, which would mean that humans have very little to do with global warming. That is not a politically correct idea right now, no matter how true it is.