Times-Picayune: The only viable solution to climate change is retrofitting existing coal plants with technology to capture carbon dioxide emissions, Entergy Corp. Chairman and Chief Executive Wayne Leonard told shareholders at the company’s annual meeting in Little Rock, Arkansas, this morning. “The U.S. cannot afford to shut down its existing coal plants, and China cannot afford to stop building coal plants,” Leonard said. “There is only one solution, and that is to fix what we have. It is the only …