2018

In 2018, Ace bought a copy of NME outside Ladbroke Grove hypertube station. In it, the Seventh Doctor had placed a personal advert that read, "Ace - Behind You!". (PROSE: Timewyrm: Revelation)

By this time, Earth was politically divided into "zones" overseen by the World Zone Authority, a successor to the United Nations. A major challenge faced by the organisation was deteriorating environmental conditions and overpopulation. (TV: The Enemy of the World)

The Second Doctor and his companions Jamie McCrimmon and Victoria Waterfield landed in Australia and became involved in Giles Kent's plot to overthrow the Doctor's double, Ramón Salamander. Salamander was a powerful figure involved in the global politics of this era. Around this time, parts of central Europe were devastated by volcanic eruptions. (TV: The Enemy of the World)

The Biodiversity Tower was built in London in 2018. (PROSE: Six Impossible Things Before Breakfast)

Taking Heather McCrimmon to a musical in New York City in 2018, the Doctor discovered the Gavulav, alien computer hackers, had infiltrated the New York Police Department so that they could fleece Earth's economy. The Doctor used a Gallifreyan counter virus to stop their schemes. (COMIC: The Greed of the Gavulav)

Alternate timelines
In an alternate future predicted by the Monks by 2018, in just one year, all life on Earth had been destroyed. (TV: The Pyramid at the End of the World)