Hydrogen vehicles create zero emissions which will be significant over time. It may take a long time to see a net effect. For example, if the overall market for autos doubles over next 20 years (at current rate, World GDP will double in 15 years) but only 50% of vehicles are hydrogen, the net effect is zero. However, this is much better than an alternative of growth with petroleum and combustion.
The kicker in this scenario of the future may be the corresponding or complementary changes in energy production; such as, home and commercial power generation (Muller, 2008). The technology for hydrogen power in vehicles can be used elsewhere. Electricity is needed to make hydrogen power; hence, with increased demand, electricity production R&D and production should change too (for example, increases solar, wind, nuclear).
References:
Muller, J. (2008, January 7). A Light Bulb Goes On – Willett Kempton sees your car and the electrical grid as a solution to America’s energy problem, not the source of it. Forbes. January 7, 2008. p. 100
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