The Clean Tech Revolution: The Next Big Growth and Investment Opportunity, is a 2007 book by Ron Pernick and Clint Wilder. They say that using clean technologies is a profitable enterprise that is moving steadily into mainstream business. Clean technologies are seen to be important for economic growth.[1]
Pernick and Wilder highlight eight major clean technology areas: solar power, wind power, biofuels, green buildings, personal transportation, the smart grid, mobile applications (such as portable fuel cells), and water filtration.[2] Very large corporations such as GE, Toyota and Sharp, and investment firms such as Goldman Sachs are spending billions of dollars on clean technology.[1]