Chemical companies today create hydrogen by cracking methane, a process that results in a tremendous amount of greenhouse gases.

FORBES: Why Hydrogen Cars Could Still Be The Future

Ah, but buy enough time, in the White House scenario, and we will have developed alternative fuels, "cold cracking" refineries and hydrogen cars.

NPR: Energy Bill Leaves Conservation on Back Burner

By cracking down on carbon and embracing hydrogen, he could even lead.

ECONOMIST: The environment