Right now people are too used to their gas-guzzling internal-combustion or diesel cars to make hydrogen fuel-cell-, elecric-, or solar-powered cars realistic today. Research in new technologies is important, but more money should be invested into hybrids.
- decrease the appeal of producing and buying such cars, and
- make the price of hybrid cars comparable to standard cars.
Hybrid cars are not much of a lifestyle change, since they never have to be charged like traditional electric cars and are filled up at the pump just as easily as normal cars.
References: Hybrids cost substantially more than their gasoline-only counterparts.