Yale Environment 360: Leaders from some of the largest pension funds in the U.S. and the world are concerned about the future profitability of fossil fuel companies, and they have asked those companies to report on their plans for managing a long-term shift toward renewable energy. Managers of 70 major pension funds, which together control about $3 trillion in investments, asked 45 of the world's largest coal, oil, gas, and electric power companies to complete the profitability studies by spring. The pension funds are...