Argentina glacier under threat

As world leaders enfold 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.

Scientists say time is running out to save melting glaciers that give fresh drinking water for millions of people.

Al Jazeera's Teresa Bo reports from the Upsala Glacier, a major body of ice in southern Argentina that is moving back at an alarming rate.