Science Buddies: "Ask an Expert"

We all know that the in all countries, one of the most important problems is the pollution, and pollution by cars is something that worries us a lot, because the majority of these problem is because of cars, so why don´t we try to make a machine witch can extract the hydrogen from the water in an easy way, so the cars witch works with hydrogen would become cheaper,
someone supports my idea? i need help.

I support your idea but how will you make this machine and how will you get other supporters?