Courmayeur (Aosta), October 26 - The Valle D'Aosta region's snow lines have retreated by some 100 meters to about 3,300 meters above sea level as the effects of recent climate change fed through to the northern Italian mountainous areas. Some 30 years ago, the snow levels in the northern Italian region were at about 2,700 meters above sea level, meaning that the snow levels have retreated approximately 600 meters over the past three decades. The data was released Friday by the glacier observation unit of the Fondazione Montagna Sicura di Courmayeur or Secure Mountain Foundation in Valle D'Aosta. On average, the glaciers retreated some 30 meters. The Tsanteleine (Rhemes) glacier retreated some 90 meters since 2008 and the Verra (Ayas) 122 meters since 2005. The Pre de Bard (Courmayeur) and Cherillon (Valtournenche) glaciers have retreated as much as 400 meters in recent years.