In the daunting math of climate action, individual choices and government policies aren't adding up. Solar panels are being nailed to rooftops, colossal wind turbines bestride the plains and oceans, and a million electric vehicles are on U.S. roads - and it isn't enough. Even if the world did an unlikely series of about-faces - halting deforestation, going vegetarian, paying $50 a ton carbon taxes, boosting energy efficiency, doubling car mileage, and more - it would not be enough.