Policemen carry metal barriers at the venue of the upcoming United Nations Climate Change Conference in Cancun, Mexico, on Nov. 24, 2010. World leaders and representatives of about 180 countries will attend renewed UN climate change talks slated from Nov. 29 to Dec. 10 in Cancun. [Xinhua]

A Mexican soldier guards at the venue of the upcoming United Nations Climate Change Conference in Cancun, Mexico, on Nov. 24, 2010. World leaders and representatives of about 180 countries will attend renewed UN climate change talks slated from Nov. 29 to Dec. 10 in Cancun. [Xinhua]