Research materials Clean Goal Environmental Inc.

Clean Edge, which has been tracking the growth of clean-tech markets for nearly a decade, reports that global revenues for solar photovoltaics, wind power, and biofuels expanded from $75.8 billion in 2007 to $115.9 billion in 2008. For the first time, one sector alone, wind, had revenues exceeding $50 billion. New global investments in energy technologies — including venture capital, project finance, public markets, and research and development — expanded by 4.7 percent from $148.4 billion in 2007 to $155.4 billion in 2008, according to research firm New Energy Finance.