All hydrogen creates is water, of which the world has a huge excess already, so no problem, unless the production of hydrogen, from sources other than solar, releases other gases like CO2. When my master plan is executed and the oil producing countries cover their deserts with solar cells, they will use the power to split the seawater they always have next to them. They will export the hydrogen and oxygen by sea, and thus maintain their incredible standard of living when the oil runs out - or much preferably before the oil runs out, so the oil can be used as raw material for manufacture. This hydrogen production will produce no global warming, or pollution of any sort.
Ther you are - problem solved. Just pay me lots of money, please.
Ray