Famine

The Fourth Doctor noted that humans had survived, among other things, famine. (TV: The Ark in Space)

Behind the scenes
According to the "Earth-Skaro Timescale" of Terry Nation's Dalek Annual 1976, Asia was struck by drought, floods and famine in the Earth year 1974. Meanwhile, in Skaro-year 10,959, the Daleks had stationed a weather control satellite in Earth's orbit.