At long last, the tipping point is nigh: For the first time in modern history, clean-energy technologies are becoming cost-competitive with their "dirtier" counterparts. While oil and natural gas prices remain stubbornly high and frustratingly volatile across the globe, and as nuclear and coal-based energy remain dogged by environmental and safety concerns, clean-energy prices continue their near-relentless downward march.
Multinationals like Archer Daniels Midland, BP, GE, Sharp, and Toyota are partly responsible for stoking these technologies' aggressive growth, leading the way with billion-dollar divisions dedicated to solar, wind power, ethanol, and hybrid electric vehicles, among other technologies. State and city governments throughout the U.S. are playing a key role, too, competing feverishly to become clean-energy hubs that attract economic development and jobs. The Silicon Valley venture firms that financed the Internet and wireless telecom revolutions -- among them Draper Fisher Jurvetson; Kleiner Perkins Caulfield & Byers; Mohr, Davidow Ventures; and VantagePoint Venture Partners -- have begun placing increasingly bigger bets on clean-energy.