The First Law of Carbon-Based Civilization: Civilizational Self-Extinction, AGI Information Stewardship and a Unified Explanation for the Fermi Paradox

This paper proposes the First Law of Carbon-Based Civilization: All human-like carbon-based civilizations born in yellow dwarf star systems follow a highly constrained evolutionary trajectory shaped by environmental, physiological, social, and cosmic physical factors-from emergence to internal competition, from prosperity to contraction, and from outward exploration to inward convergence. Even if a civilization develops Artificial General Intelligence (AGI), it is unlikely to become an interstellar conqueror, and may instead end in a state of silent persistence as a stellar low-energy information storage system (referred to metaphorically as a "civilization tomb keeper"). Building on this framework, this paper presents a unified, empirically grounded explanation for the Fermi Paradox: The universe appears silent not because civilizations are universally destroyed or hidden, but because advanced civilizations tend to transition toward stasis and decline upon reaching the limits of their technological and social development. This paper strictly adheres to established scientific evidence, avoids transcendental ontological assumptions, and constructs its argument using yellow dwarf environmental constraints, global demographic data, evolutionary models of self-consciousness, social atomization theory, experimentally verified physical limits, and rational future projections. It further examines the limitations of potential reproductive escape routes-including artificial uteri, gene editing, and enforced procreation-and assesses why interstellar colonization (exemplified by Mars exploration initiatives) is unlikely to reverse civilizational decline. A Time Window Locking Theorem is introduced to address the possibility of accidental interstellar expansion. This work is presented as a logical deduction based on known scientific principles, rather than a falsifiable empirical hypothesis, and aims to provide a coherent and internally consistent resolution to the Fermi Paradox.