Why coal? Because “there is no silver bullet” to stop global warming, says Liam Salter, head of WWF’s climate-change program in Hong Kong. Nor is it practical to rule out the dirty but abundant fossil fuel. The report envisions “a clearly defined, though limited, role for coal in a climate-friendly economy.” Coal would fire highly efficient (and still experimental) power plants that store CO2 underground. Conservation would help bridge the gap between now and 2030, when the new coal plants will be ready.