Indian American Silicon Valley billionaire Vinod Khosla tops the list of 10 greenest billionaires chosen by Forbes "who are most active in green, sustainable causes and who are working to have the greatest impact."
The leading US business magazine said it found the top ten "are altruistic, yes, but most of them are also very much aiming to turn a profit" and they hail not just from the US but also from Israel, Germany and Canada.

"Khosla-a cofounder of Sun Microsystems and a longtime partner at venture capital powerhouse Kleiner Perkins Caufield & Byers-has, with fellow billionaire and green business supporter John Doerr, been pouring millions of dollars into green tech companies," Forbes noted.