 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 . 
 The Clean Tech Revolution : The Next Big Growth and Investment Opportunity <a href='drop_aux' title='1'><mark>is</mark></a>a 2007 book by Ron Pernick and Clint Wilder , <a href='null_relcl' title='2'><mark>who</mark></a>say that commercializing clean technologies is a profitable enterprise <a href='null_relcl' title='3'><mark>that</mark></a>is moving steadily into mainstream business . As the world economy <a href='uninflect' title='4'><mark>faces</mark></a> 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 . 
The Clean Tech Revolution : The nxt bigg Growth and Investment Opportunity a 2007 book by Ron Pernick and Clint Wilder , say that commercializing clean technologies is a profitable enterprise is movin steadily into mainstream business . As the world economy face challenges from energy price spikes , resource shortages , global environmental problems , and security threats , clean technologies r seen to b da nnxtengine of economic growth .