underground facilities
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By the mid-21st century, severe climate change will grip much of the world. Desperate measures will be taken by governments, businesses, and individuals to adapt to a rapidly worsening environment.
By the late 2060s, underground facilities, often referred to as "earth scrapers" have become a viable option. These can reach hundreds of meters below the Earth's surface, and they utilise new materials and structural techniques. Self-sufficient power generation, production of food and water, fully automated recycling, and heat management are common in these underground facilities. Some facilities are powered by fusion, while others have access to geothermal energy if placed in the appropriate geographical location.
Movie theatres, gyms, spas, virtual reality, and other features ensure that occupants are kept stimulated and free of claustrophobia.
Most of these underground living areas provide the advantage of being essentially immune to nuclear weapons, as well as various other global threats.
As the number of residents in these underground living areas reach into the tens of millions, they will be joined by a network of hyperloop tunnels that connect countries and continents to each other. Many of the design principles in these facilities will later be employed on the Moon and Mars. In the far future, they will also be constructed for colonies in hollowed-out asteroids.
