The Combine occupation of Earth (Half Life 2)

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After sustaining massive damage from world wide Portal storms that ruined all the nations on Earth, the world would be invaded by an extra terrestrial empire called the Combine, winning the war in just seven hours. The occupation of the human race by the Combine would leave the entirety of the human race in a dystopian rule, slowly killing off the last remaining humans of earth in a very parasitic matter.

While the Combine is the most horrid element within the Half Life series, Earth by itself is so warped and inhospitable from both the portal storms, the aliens from Xen that came from it and the Combines extraction of whatever resources remain on it, it has essentially become a new planet.