Fossil Fuels will be used in most Hydrogen producing plants. The good thing about producing Hydrogen fuel is that it will be clean after it is made. The plants that produce H2 will have scrubbers to collect at least 90% of the Co2 gases before it goes into the atmosphere. Presently you have millions of transportation vehicles, trains, planes, boats, etc, emitting tons of Co2 that help create the Global Warming effect. You will see other technogies that won't require the use of fossil fuels. Hammerfest Energi is presently working on some cool stuff.