Homer stores the pig's feces in an overflowing silo, which disgusts Marge. Homer attempts to dispose of it safely at Marge's request, but is in a rush and instead dumps the silo in the lake, critically polluting it. Moments later, a squirrel stumbles into the lake and becomes severely mutated. Russ Cargill, head of the United States Environmental Protection Agency (EPA), informs President Arnold Schwarzenegger on Springfield's pollution crisis and presents five solutions. The President randomly picks the action of enclosing Springfield in a giant glass dome. When Homer's silo is discovered, the townspeople form an angry mob, ransack the Simpsons' house and attempt to lynch them. After a failed attempt by Ned to save them, the family escapes through a sinkhole in Maggie's sandbox, which destroys the house soon after, and flee to Alaska using a truck Homer later wins at a contest, where they restart their life.