Principles of Environmental Science

Module 1 (9/1–9/7) · Principles of Environmental Science · Blueprint Pillar 3 · PGCC Outcome 1 · Download .docx

Objectives

Define environmental science and describe its interdisciplinary nature.
Explain the scientific method and distinguish a hypothesis from a theory.
Identify abiotic and biotic factors and describe the levels of ecological organization.
Define ecosystem services and explain the sustainability triangle.

Key terms

Environmental science: Interdisciplinary study of human interactions with the natural world.
Hypothesis: A testable, falsifiable explanation for an observation.
Abiotic factor: A nonliving physical or chemical component of an environment (temperature, pH, light).
Biotic factor: A living component of an environment — any organism or its products.
Population: All individuals of one species living in the same area at the same time.
Community: All populations of different species living and interacting in the same area.
Ecosystem: A community of organisms plus the abiotic factors they interact with.
Biosphere: All ecosystems on Earth — the total of all living organisms and their environments.
Ecosystem services: Benefits that functioning ecosystems provide to humans at no charge — clean water, pollination, climate regulation.
Tragedy of the commons: The tendency for shared resources to be overused when each user acts in individual self-interest without collective limits.
Sustainability: Using resources to meet present needs without preventing future generations from meeting theirs (Brundtland, 1987).
Scientific method: Systematic cycle of observation → question → hypothesis → experiment → conclusion used to test claims about the natural world.

The concept

Environmental science is the interdisciplinary study of how humans interact with the natural world — it draws on biology, chemistry, geology, economics, and policy. The scientific method drives this inquiry: observation leads to a question, a testable hypothesis is formed, an experiment is designed, and a conclusion is drawn. A hypothesis must be both testable and falsifiable.

Ecological organization runs from smallest to largest: organism → population → community → ecosystem → biosphere. Abiotic factors are nonliving components (temperature, rainfall, soil chemistry); biotic factors are all living organisms. Each level has emergent properties the level below it does not.

Ecosystem services are the benefits healthy ecosystems provide to humans free of charge: clean air and water, pollination, flood control, climate regulation, and cultural value. The tragedy of the commons warns that shared resources get depleted when individuals each act in short-term self-interest. Sustainability — meeting present needs without compromising future generations — balances environment, economy, and society simultaneously.

Self-check

Try each one before you look. A miss here costs nothing and tells you exactly what to reread.

1. Which of the following correctly defines an ecosystem?

2. The tragedy of the commons explains resource depletion through which core mechanism?

3. Which of the following is an example of an abiotic factor?

4. Sustainability, as defined by the Brundtland Commission (1987), requires that present generations:

5. Climate regulation through carbon sequestration in forests is an example of which type of ecosystem service?

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