Reuters: Bill Gates grows most animated when the talk turns to the "cool" new energy technologies that have yet to leave the lab.
Gates was a rare civilian sharing the limelight alongside presidents and prime ministers at the opening session of Paris climate talks on Monday.
Offstage, in a barren conference room, he excitedly described the possibility of generating energy through the long-speculated process of artificial photosynthesis, using the energy of sunshine to produce liquid hydrocarbons that...