South Sudan

Sudan has been at war with itself for decades. Arab Muslims in the north have long dominated Christian and animist Africans in the south. But, in a referendum scheduled for January 2011, southerners are expected to vote for separation. And the divorce may not be pretty. The south will take water, land, and about three quarters of Sudan’s oil with it. That’s one of many reasons the north opposes the divorce, and why there’s fear of a return to conflict. 

AK-47s, grenades, water?  Earth's most precious resource doesn't fire bullets or explode but it is guarded, hoarded, and stolen in a way that ignites political tensions on a local level and an international scale.