This is a bad episode of The Outer Limits mixed with the last few minutes of An Inconvenient Truth. There is no justification for the mass murder and by the end you do not even care.
Those of you that saw the previous Hulk movie might be a little nervous about going to see this film but this is not Ang Lee's Hulk. This is a new and improved formula with the right mix of the fast and furious action of the Hulk and slow action build up of the Bruce Banner story. Go see it. Hulk Smash.