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Earth became a dystopian society. It was overpopulated with too many humans and it politically unstable with corruption and military from other nations are in high demand to keep the peace. Too much mass consumerism lead to the lack of natural resources and pollution. To survive one day on the planet, humans have to wear exopacks over their faces. As a result, Earth is now an urban slum that's facing a worldwide economic and energy crisis. With little to no resources left, the humans had to turn their attention to Pandora that boasted one natural resources they need, Unobtanium.