Human-environment relationships (Man-Land Relationship) are the core thread in geographical research. This section focuses on how human society, as an open system, exchanges matter and energy with the geographical environment through production and consumption activities. From the historical concept ofgeographical environmental determinismto modernharmony theory, the core lies in establishing a sustainable development path based on harmonious coexistence between humans and nature.

Core Concept Analysis

• Cyclic Model: Analyzes the closed-loop process by which human society extracts resources (inputs) from nature, transforms them into consumer goods, and discharges waste products (outputs), including the 'three wastes'.
• System Feedback: When human resource extraction exceeds the environment's regenerative capacity, or waste emissions surpass its self-cleaning ability, the human-environment relationship shifts from 'harmony' to 'imbalance,' triggering various environmental issues.
• Dual Role: The environment acts as both a 'resource source' providing survival materials and a 'purification pool' absorbing waste. Understanding the balance between these two roles is central tothe coordinated development of human-environment relationshipsthe key.