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Hi Tiroch, some scientists believe that the Himalayas are a major factor in the current ice age of which we have been in recession from for around 10,000 years, but it is still an unproven hypothesis as the geologic record dating back to Tethyan sediments do not match with known ice age periods.
The Himalayas' formation started about 70 million years ago with the Indo Australian plate colliding with the Eurasion plate. In fact we are still moving north but the Eurasion plate is now stretching causing the Himalayan chain to in fact decrease in height.
There is more evidence to suggest that the movement of the plates themselves are altering the flow of warmer water to the north and south areas which in turn would cause larger ice sheets and reflect the warmth away from the Earth.
With the increase of CO2 levels the opposite is fact happening regardless of tectonic movement.
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