 In France all six of the major glaciers in that country are in retreat . On Mont Blanc , the highest peak in the Alps , the Argentière Glacier has receded 1 @,@ 150 m ( 3 @,@ 770 ft ) since 1870 . Other Mont Blanc glaciers have also been in retreat , including the Mer de Glace , which is the largest glacier in France at 12 km ( 7 @.@ 5 mi ) in length but retreated 500 m ( 1 @,@ 600 ft ) between 1994 and 2008 . The glacier has retreated 2 @,@ 300 m ( 7 @,@ 500 ft ) since the end of the Little Ice Age . The Bossons Glacier once extended from the summit of Mont Blanc at 4 @,@ 807 m ( 15 @,@ 771 ft ) to an elevation of 1 @,@ 050 m ( 3 @,@ 440 ft ) in 1900 . By 2008 Bossons Glacier had retreated to a point that was 1 @,@ 400 m ( 4 @,@ 600 ft ) above sea level . 
