9. Avatar
The Plot: Pocahontas in space. Nature loving aliens live over a goldmine of Unobtanium, and corporations want it. The military wastes trillions of dollars in a plan that ends up horribly backfiring. Humanity evil, nature good.
The Solution: It's funny I mentioned Alien before, since James Cameron, director of Avatar, directed the sequel. There, Ellen Ripley once again figures out the PERFECT solution to the problem: "take off, and nuke the site from orbit." What is more price effective? The Avatar program or a few nukes? The humans do not care about Pandora's ecosystem, so why not cut to the chase? When it was clear the Na'vi wouldn't cooperate--and were openly hostile--why didn't they just nuke them? Why engage them in warfare at all? The moment the Na'vi mobilized an army at the end of the film, nuke them! You don't need the foliage to mine materials deep underground. The bad-ass general guy really should've gotten his head in the game there.