The glacier was uninhabited before 1984, and the presence of thousands of troops since then has introduced pollution and melting on the glacier. To support the troops, glacial ice has been cut and melted with chemicals. Dumping of non-biodegradable waste in large quantities and the use of arms and ammunition have considerably affected the ecosystem of the region.
Glacial retreat:
Preliminary findings of a survey by Pakistan Meteorological Department in 2007 revealed that the Siachen glacier has been retreating for the past 30 years and is melting at an alarming rate. The study of satellite images of the glacier showed that the glacier is retreating at a rate of about 110 meters a year and that the glacier size has decreased by almost 35 percent.
In an eleven-year period, the glacier had receded nearly 800 meters, and in seventeen years about 1700 meters. It is predicted that the glaciers of the Siachen region will be reduced to about one-fifth of their 2011 size by 2035. In the twenty-nine-year period 1929–1958, well before the military occupation, the glacial retreat was recorded to be about 914 meters. One of the reasons cited for the recent glacial retreat is chemical blasting, done for constructing camps and posts.
In 2001 India laid oil pipelines (about 250 kilometres long) inside the glacier to supply kerosene and aviation fuel to the outposts from base camps. As of 2007, the temperature rise at Siachen was estimated at 0.2 degree Celsius annually, causing melting, avalanches, and crevasses in the glacier.

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