Environmental Ethics

Step 1: Understanding the Concept:
The question asks to identify the specific school of environmental ethics that is defined by a set of core principles: intrinsic value of nature, concern over human population, and emphasis on a simpler lifestyle.

Step 3: Detailed Explanation:
Deep Ecology is an environmental philosophy that promotes the inherent worth of all living beings, regardless of their instrumental utility to human needs. Its key tenets, as formulated by Arne Naess, include:
In contrast, Shallow Ecology is anthropocentric (human-centered), viewing the environment as a resource for humans to use. Social Ecology links environmental problems to social and political structures. Green Ecology is a broader, less specific term.

Step 4: Final Answer:
The principles listed are the core tenets of Deep Ecology.