There are no efforts in the United States to follow Iceland's lead. One reason: in the United States, renewable energy sources like hydroelectric dams, solar arrays, and wind farms represent such a small percentage of the electricity grid that even if they were used for electrolysis, not enough hydrogen to power significant numbers of residential fuel cells could be produced. In fact, most experts say that the transition to a hydrogen-from-water fuel cell energy system in the United States isn't likely before the end of this century. To do better than that, says John Turner, senior scientist at the National Renewable Energy Laboratory in Golden, Colorado, a government laboratory, would require a huge long-term thrust with unyielding support from Washington, D.C., and not a quick fix effort with a short attention span. "I've heard people say we need a Manhattan project," Turner says. "Actually, it would be more like the interstate highway project."