‘Heroin Warfare’ - Since the U.S. occupation of Afghanistan, heroin production in the region has skyrocketed, making the country the number-one producer in the world by a large margin. Suroosh Alvi got a rare look inside Iran to meet the suffering heroin addicts, and to see how the country is coping with the illegal drug trade. ‘The Coldest War’ - With the polar ice caps shrinking due to global warming, new trade routes are being exposed, along with billions of dollars' worth of natural-resource reserves. This is prime real estate and the five nations bordering the Arctic are readying themselves to fight for it. David Choe headed north to witness NATO forces participating in the largest polar military exercise in history.