Cheap renewables won’t stop global warming, says Bill Gates “Electricity is just 25 percent of greenhouse gas emissions,” said Gates. “There is no substitute for how the industrial economy runs today.” When financial analysts proposed rating companies on their CO2 output to drive down emissions, Gates was appalled by the idea that the climate and energy problem would be easy to solve. He asked them: “Do you guys on Wall Street have something in your desks that makes steel? Where is fertilizer, cement, plastic going to come from? Do planes fly through the sky because of some number you put...