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 . The Clean Tech Revolution 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 .