Simplify the following text for a Grade 11 native English-speaking person.
Original: 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 .
Simplified: 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 .