What can a war between India and Pakistan lead to?

--- Nair Khan,

India and Pakistan are two nuclear-armed countries, and their opposing armies often exchange fire that leads to the deaths of innocent people on both sides of the Line of Control that separates India-administered and Pakistan-administered parts of Kashmir. Kashmiris have been resisting the Indian rule for long. Since 1989, the Indian army has killed around one hundred thousand Kashmiris. 

India has 700,000 soldiers in Kashmir to crush those who want freedom from the Indian rule. In case of war between these two countries, there is every possibility they two countries will also resort to nuclear weapons, thus endangering not only the populations of their countries, but also bringing and destruction to all forms of life globally.