New York Times: In a sweeping effort to reduce its environmental impact, New York City is planning to overhaul the energy-efficiency standards of all its public buildings and to pressure private landlords to make similar improvements. The initiative is part of a pledge, to be announced before the start of the United Nations Climate Summit on Tuesday , to decrease greenhouse gas emissions by 80 percent by 2050 from 2005 levels. The United Nations has pointed to that rate of decrease as a desired target for developed...