It doesn't seem unusual at all lately for either artist to choose work that has close ties to what's going on with the world at large. Politics, war and corruption in all the world's 'systems' has been a common thread for both -- Damon's portrayal as an undercover criminal FBI agent in The Departed gave me a new level of appreciation for his work. Greengrass is responsible for bringing us last year's fresh and catastrophically brilliant United 93. Whether the world was ready to see it or not Greengrass didn't hesitate to capture his perception of the real-life events and project them on the screen for the world to see.
Imperial Life in the Emerald City deals with the actual happenings inside Iraq's now insurgency ridden infrastructure. The book discusses and presents reasons for the prolonged troops in Iraq and instability and negligence with rebuilding a thriving government. Greengrass will adapt the screenplay himself, dealing unapologetically with the (unfortunately) non fiction material -- making a terribly interesting picture at the very least and perhaps another gifted and strangely familiar role for Matt Damon.