Khosla Ventures was started in 2004 by Vinod Khosla, one of the co-founders of Sun Microsystems, where he served as CEO and chairman in the early 1980s before joining venture capital firm Kleiner, Perkins, Caufield & Byers in 1986.
Khosla has invested some $1.1bn in clean technology companies and tech companies. One is UK-based Calera, which has a process to sequestrate carbon emissions in cement. Another, Kior, turns wood chips into biofuels.
Blair said in a statement he was "increasingly and crucially aware" that dealing with climate change and energy security depended on technological solutions.