New York Times: A guide shows off row after row of gleaming, black, chrome-coated tubes used in the millions of solar thermal water heaters Himin Solar Energy Group produces each year. The corporate building alone saves 1 million kilowatt-hours by using solar heating, the guide informs his group. But when he is asked how many tons of carbon dioxide emissions the average solar water heater saves, silence fills the hall. “Normally, in China, we just calculate energy efficiency,” the guide offers …