As world leaders wrap up a climate change summit in Cancun, Mexico, aimed at reaching an emissions deal, countries across the world are witnessing worrying effects of global warming. <br /><br />Scientists say time is running out to save melting glaciers that provide fresh drinking water for millions of people.<br /><br />Al Jazeera's Teresa Bo reports from the Upsala Glacier, a major body of ice in southern Argentina that is receding at an alarming rate.<br /><br />[December 10, 2010]
