Reveals the enormous physical possibilities of happy, healthy human populations on Earth, using only current technologies and their expectable developments. Go beyond gloomy population limits of 4 - 10 billion to see exactly how we can support trillions with this series of limit analyses.
Introduces thermodynamic problems for human habitats, whether to make the Earth's surface uninhabitable, outgoing longwave radiation (OLR), eliminating the greenhouse effect using sequestration, the thermal structure of the human habitat, the Earth population limit of heat, thermodynamic bottlenecks, and the conclusion.
9 Dec 2025
Energy
Discusses energy generation technologies, passive vs active, considers conventional nuclear power, geothermal, terrestrial solar power, space-based solar power (SBSP), the energy required per person, the Earth population limits of geothermal and terrestrial solar, the challenges of a space-based solar power constellation, and SBSP scaling
8 Dec 2025
Elements
Introduces elemental limits, and analyzes Oxygen, Silicon, Calcium, Iron, Aluminum, Nitrogen, Carbon, Chromium, Copper, Potassium and Phosphorus. Addresses waste management and recycling.
7 Dec 2025
Food
Explains indoor agriculture, compares indoor vs outdoor agriculture, and emphasizes the omnivorous diet.
6 Dec 2025
Water
Describes water management, the water required per-person and the Earth population limit of water.
5 Dec 2025
Space
Covers the square-cube law, the volume required per person, a moderate scenario using only already-inhabited land, the habitable space of the Earth, and the Earth population limit of habitable space.
4 Dec 2025
Rules of This Game
Describes the purpose and approach of this analysis, provides a timeline of population growth, and lists all of the bottlenecks it will consider.
3 Dec 2025
Environmental Conservation
Explains and addresses environmental concerns, offers space colonization as the solution to conservation concerns, and keeps the focus on the limit analysis of human carrying capacity on Earth.
2 Dec 2025
Introduction
Welcome to Human Carrying Capacity of the Earth! This chapter covers the question, what carrying capacity is, what sustainable is, and describes previous work with other estimates of the human carrying capacity of the Earth.
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