Why not just burn the feilds closest to the Taliban stronghold, compensate the farmers and assure them that the feilds would grow back the next year? it would also give our guys a clear line of fire, and give any fleeing Taliban nothing to hide in. It's an old tactic and probably not very useful here because of the hostage thing. Of course if it's green pot plants then they won't burn and burning the brown ones has 'adverse effects.' Though in a perfect world if you were to burn the feilds and the Taliban saw the tanks aiming at them out of RPG range they would be inclined to surrender.