With winter break approaching, campus environmental groups have mounted a campaign to leave energy consumption out in the cold. The Pull-the-Plug campaign -- which has been advertised with posters and table tents at Frist and the residential colleges -- asks students to sign the "Plug Pledge," agreeing to unplug appliances, switch off lights, shut windows and turn down thermostats before they leave for break in an effort to reduce energy consumption.<br><br><a href='http://www.dailyprincetonian.com/archives/2006/12/12/news/16968.shtml&#039; target='_blank'>http://www.dailyprincetonian.com/archives/2006/12/12/news/16968.shtml&lt;/a&gt;&lt;br&gt;&lt;br>