The Clean Tech Revolution: The Next Big Growth and Investment Opportunity is a 2007 book by Ron Pernick and Clint Wilder, who say that commercializing clean technologies is a profitable enterprise that is moving steadily into mainstream business. As the world economy faces challenges from energy price spikes, resource shortages, global environmental problems, and security threats, clean technologies are seen to be the next engine of economic growth. Pernick and Wilder highlight eight major clean technology sectors: solar power, wind power, biofuels, green buildings, personal transportation, the smart grid, mobile applications, and water filtration. Six major forces, which they call the six C's, are pushing clean technology into the mainstream: costs, capital, competition, China, consumers, and climate. Very large corporations such as GE, Toyota and Sharp, and investment firms such as Goldman Sachs are making multibillion-dollar investments in clean technology. The book has been reviewed in USA Today, Business Week, Energy Priorities, Sustainability Investment News and several other magazines, and has been translated into seven languages. Clean Tech Nation is the sequel to The Clean Tech Revolution. (en)