Latin American Herald Tribune: Mexico City authorities have announced an emergency, 10-month water rationing plan in response to severe shortages that Mayor Marcelo Ebrard blames on global warming. “This year we’ve had the least amount of rainfall in many years. That’s caused the Cutzamala system, which … accounts for a significant percentage of the city’s supply, to have lower levels than it should have,” Ebrard told a press conference on Thursday. The National Water Commission, or Conagua, has warned in …