(19)The scale of infrastructure projects means that they require large amounts of capital to remain invested for long periods of time. Such infrastructure projects include public building infrastructure such as schools, hospitals or prisons, social infrastructure such as social housing, transport infrastructure such as roads, mass transit systems or airports, energy infrastructure such as energy grids, climate adaptation and mitigation projects, power plants or pipelines, water management infrastructure such as water supply systems, sewage or irrigation systems, communication infrastructure such as networks, and waste management infrastructure such as recycling or collection systems.