What would happen if the volcanic cap underneath Yellowstone blew? It likely would usher in a worldwide winter that would last more than a decade. Who knows what a polar shift might cause.
To date, the United States is the only country to ever deploy nuclear weapons. TWICE!
Most Americans believe it was necessary, damn be the consequences of the fallout that affected millions. This is a dangerous world we live in, and always has been. India, and Pakistan, are indeed armed with nuclear weapons. As are we, and Russia, and China, and Israel, and so on.
If India and Pakistan pull the trigger, or the super volcano blows at Yellowstone, all anybody can do is watch.
Should the United States try to talk both sides down? Sure. But in the end, it's their war, and their call.
I'll choose not to fret. What ever happens, I will not be consulted. Before, or after.
For India and Pakistan to engage in a nuclear exchange would ensure mutual total destruction. I suspect that has occurred to both sides.