India and Pakistan, my far fetched theory
Ok, the two countries go to war. This war would at least partially solve 3 of the world's largest problems. Let's say they use their full nuclear arsenals, which is 70+ nukes. Kashmir is then mostly uninhabitable because this is where most of the fighting took place; problem 1 solved. The Indian and Pakistani armies are severely weakened. It is said that 70 milion people could die from these nukes. Many Taliban and al-Qaida are killed in Pakistan by the Indian nukes; problem 2, mostly solved. The fallout causes the global temperature to slightly decrease therefore countering the effects of global warming; problem 3 solved.