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Turn off your air conditioner and stay cool in your shirt instead. That's the idea behind a new plastic-wrap-like material that Stanford University scientists say could be made into "cool" clothing, the use of which could slash emissions and energy consumption in buildings. If woven into fabric, the wearable cloth could keep humans cool on the hottest of days, eliminating the need to adjust the thermostat or crank up a fan. That could make a dent on a major source of U.S. greenhouse gases, the researchers say.