Type 0

A Type 0 or K0 civilization extracts its energy, information, raw-materials from crude organic-based sources (i.e. food/wood/fossil fuel); pressures via natural disaster, selection, and societal collapse creates extreme (99.9%) risk of extinction; it is capable of orbital spaceflight; in fiction, societies that fail to improve social conditions, environmental and medical understanding concurrently with other advancements, frequently accelerated their own extinction. It could be considered similar to 21st-century Earth.

Detail
Energy usage: 106 W to 1016 W, Unaided Metabolic to Fission

Estimated Population: Up to 10 billion people (1010)

Travel: Up to intra-system space travel

Quality of life (gov): Tribal, Theocracy, Monarchy, Democracy

State of forms: single, biological

WMD scale: nuclear fission and nuclear fusion

Longevity: 35-100

Social issues: Colonization, Religion, Automation, Air pollution, Use of Biotech

Industrial revolutions: Agriculture, Industry

Arguments: Gender, Race, Class, Religion

Dominant proliferation: ordinary biological reproduction

Social weakening: famine and disease without proper mitigation capacity (solution: biotech agriculture and medicine)

Social dream: Global cultural dominance

Class system: Proliferated by current ruling class with heuristics (e.g. consent of governed) to allow coordination

Civilizations that are considered Type 0
Homo Sapiens