The document discusses challenges facing modern cities like contamination, crime, quality of life, and energy issues. It then outlines the author's vision for the future city, focusing on energy, security, mobility, and healthcare. The future city is envisioned to have more renewable energy and efficient appliances. Security would be improved with surveillance cameras and tracking devices. Mobility would be advanced with self-driving electric cars, high-speed train systems like Hyperloop, and aerial public transport. Healthcare innovations could include nanotechnology, assistive robots, predictive health implants, and bionic replacements.