The document discusses various topics related to a future city including security, water and waste management, tourism and hospitality, transport, energy management, disaster relief, and green building. For security in the future city, it suggests using more cyborg guards, spending more on public awareness, and advanced security equipment. For water management, it proposes recycling water, rainwater harvesting, and sensors on taps to reduce water waste. The document also outlines ideas for public transit systems, renewable energy sources, and prioritizing nature in green building construction.