<human>:  When did the Third World food crisis start?
<bot>: The Third World food crisis began in the 1970s and 1980s. It is caused by a number of factors including climate change, population growth, and the use of agricultural land for non-agricultural purposes. The global population has increased by more than 50% since 1970, and the world’s population is expected to reach 9 billion by 2050. This rapid increase in population has strained the planet’s resources, leading to the depletion of natural resources and the overuse of agricultural land.