52nd century

By the 52nd century, the Earth no longer had winters, due to pollution. Enviromentalists were concerned about the Warp footprint of vessels. (WC: The Frozen)

Major Events

 * 5113 - The ice planet Winter Wonderland is quickly warming up due to orbital decay. (WC: The Frozen)
 * 5145 - River Song escapes from the Stormcage containment facility.