Michael Giberson The WSJ’s Environmental Capital blog reports that venture capital firm Kleiner Perkins Caufield and Byers (early backers of companies like Sun Microsystems, Amazon.com and Google), has become excited by clean technology. Kleiner partner John Doerr said the company hoped to cash in on what it believes will be a multi-trillion-dollar market for alternative … More Alternative Energy: John Doerr Calls It the Largest Economic Opportunity of the 21st Century … More Alternative Energy: John Doerr Calls It the Largest Economic Opportunity of the 21st Century