Salt Lake Tribune: The Obama administration is sending hopeful signals by pouring cash into green technologies and trying new approaches to world diplomacy, but his greatest challenge is to rescue the banking system, New York Times columnist Thomas Friedman told a crowd of Utahns lunching in Salt Lake City on Tuesday. In advance of The World Is Flat author’s sold-out 7 p.m. lecture at Abravanel Hall, Friedman dined with a few dozen Utah Museum of Natural History donors and Hinckley Institute of Politics …