In 1985, Nairobi had a population of 1 million people. By 2035, over the span of just 50 years, Nairobi is on track to have an estimated 8.5 million people. As more people migrate from rural to urban areas, who will feed this growing urban population? As food security concerns grow for the city of Nairobi, farmers like Francis Wachira are transforming urban lots into highly productive green spaces to raise livestock, grow vegetables, and fight climate change. Nairobi will depend on urban farmers like Francis to produce sustainable food systems that promote healthy and affordable diets to feed the future.