Charles X. Yang

Greedy desire is the core driver of human civilizational crisis, yet no unified dynamic model spanning the neural, social, and thermodynamic levels has been developed. This paper employs System Dynamics as its methodological framework, integrating evolutionary neuroscience, complex systems theory, and thermodynamics to construct a Three-Level Greedy Positive-Feedback Model (3L-GFM). At the neural level, the model captures the dual positive-feedback structure of the dopaminergic reward circuit and the amygdala anxiety system, along with the negative-feedback intervention mechanism mediated by mindfulness cultivation through the prefrontal cortex. At the social level, the model describes the mutual nesting of three key positive-feedback loops: the wealth-power-policy triangle, the information monopoly–cognitive control loop, and the military-industrial complex loop. At the thermodynamic level, the model takes entropy increase rate as its core variable, constructing a physical description of the civilizational cancer process driven by greedy desire. The three levels are coupled through the Desire Amplification Factor (DAF) and the Cosmic Constraint Function (CCF). Simulation analysis reveals three critical bifurcation points — the Neural Tipping Point (NTP), the Social Tipping Point (STP), and the Thermodynamic Tipping Point (TTP) — before which the system retains self-repair capacity and after which positive feedback dominates and the system trends toward irreversible collapse. Simulations of Natural Cybernetics intervention strategies demonstrate that implementing intergenerational constraint institutionalization, ecological red-line anchoring, and entropy responsibility accounting before tipping points can guide the system toward a low-entropy stable state. 贪婪欲望是人类文明危机的核心驱动力，但迄今缺乏一个跨越神经、社会与热力学三个层次的统一动力学模型。本文以系统动力学（System Dynamics）为方法论框架，整合进化神经科学、复杂系统理论与热力学，构建贪婪欲望的三层次正反馈模型（3L-GFM：Three-Level Greedy Positive-Feedback Model）。在神经层次，模型捕捉多巴胺奖励回路与杏仁核焦虑系统的双重正反馈结构，以及正念修炼通过前额叶皮层介导的负反馈干预机制；在社会层次，模型描述财富-权力-政策三角、信息垄断-认知控制与军工复合体三条关键正反馈回路的相互嵌套；在热力学层次，模型以熵增速率为核心变量，建立贪婪欲望驱动的文明癌症过程的物理描述。三个层次通过「欲望放大系数」（DAF：Desire Amplification Factor）和「宇宙约束函数」（CCF：Cosmic Constraint Function）实现耦合。仿真分析揭示：文明系统存在三个关键分叉点——神经临界点（NTP）、社会临界点（STP）和热力学临界点（TTP）——在此之前系统具有自我修复能力，在此之后正反馈主导，系统趋向不可逆崩溃。自然控制论干预策略的仿真表明，在临界点之前实施代际约束制度化、生态红线锚定和熵责任核算，可将系统导向低熵稳态。