Nairobi, Kenya's capital and home to 3.1 million people, is a major hub for finance, media, technology and air travel. As in other large African cities, development remains haphazard and the management of waste, sewage and water are urgent challenges. Nairobi's population is expected to more than double by 2020, so the government is under increased pressure to make the capital more livable and environmentally friendly. While the city has undertaken substantial efforts to protect green spaces, its policies to improve public transport, energy and air quality have been relatively weak.