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Chapter 1: Introduction to Environmental Science

  • What is our environment?

    • Definition: Everything around us, which includes both natural and human-built environments.
    • Composed of four spheres: atmosphere, lithosphere, hydrosphere, and biosphere.

  • Environmental Science

    • Multidisciplinary branch of science.
    • Includes substantial emphasis on:
    • Biology
    • Chemistry
    • Geology
    • Physical Science
    • Mathematics
    • Integrates ethics, economics, policy, and environment.

  • Paradox of Environmentalism

    • How do we know? Human well-being has improved over the last 48 years due to:
    1. Population growth, with natural ecosystems providing essential goods and services.
    2. Ecosystem degradation has notably declined.
    3. Biodiversity loss and its significance.
    4. Global climate change impacts.

Environmental Movement

  • Environmentalists

    • Individuals focused on environmental concerns.
    • Key figure: Rachel Carson
    • Contribution: Wrote "Silent Spring"
    • Influence: Advocated for awareness of environmental issues caused by pesticides (e.g., DDT harming wildlife and humans).

  • Three Themes of the Environmental Movement

    1. Sound Science
    • Knowledge obtained through the scientific method, emphasized through observation, hypothesis testing, and experiments.
    1. Sustainability
    • Definition: Development that meets current needs without compromising future generations.
    1. Stewardship
    • Managing natural resources for the greater good of humanity.

  • Key Figures in the Environmental Movement

    1. John Muir (1838-1914)
      • Founder of the Sierra Club.
      • Major advocate for U.S. National Parks, including the preservation of Yosemite Valley.
      • Promoted the idea that nature holds inherent beauty beyond mere resources.
    2. Wangari Maathai (1940-2011)
      • Founded the Green Belt Movement in Kenya, focusing on tree planting and environmental conservation linked to women’s rights and democracy.
      • First African woman to receive the Nobel Peace Prize.
    3. Muhammad Yunus (1940-Present)
      • Founder of Grameen Bank.
      • Worked towards helping poor communities achieve financial independence.
      • Nobel Peace Prize winner.
    4. Garrett Hardin (1915-2003)
      • Authored "The Tragedy of the Commons" (1968), explaining how shared resources can be overexploited.
    5. Aldo Leopold (1887-1948)
      • Author of "A Sand County Almanac."
      • Developed the concept of a "land ethic," emphasizing humanity's role within nature.
    6. Theodore Roosevelt (1858-1919)
      • U.S. President known for his significant conservation efforts, initiating the establishment of 150 national forests and five national parks, protecting approximately 238 million acres of public lands.

Review Questions for Chapter 1

  1. What is our environment?
  2. Discuss the implications of the environmental movement and its key figures.

Chapter 2: Economics, Politics, and Public Policy

  • Economics and the Environment

    • Definition: Economics is the social science that deals with the production, distribution, and consumption of goods and services.
    • Definition of environmental goods and services: Benefits provided by nature (e.g., wood, food, clean water, air purification, climate regulation).
    • Types of economic systems:
    • Centrally Planned Economy (e.g., North Korea, Cuba).
    • Free Market Economy (e.g., United States and Canada).

  • What does a sustainable economy look like?

    • Meets current needs without compromising future needs.
    • Brown vs. Green Economy Models:
    • Unsustainable model: Relies on fossil fuels, high pollution, and waste.
    • Sustainable model: Uses renewable energy, reduces pollution, and encourages recycling.

  • Measuring Economic Progress

    • Gross National Product (GNP): The monetary/market value of all finished goods and services produced, whether within or outside a country’s borders.
    • Gross Domestic Product (GDP): The monetary/market value of all finished goods and services produced within a country’s borders.
    • Genuine Progress Indicator (GPI): A measure of economic sustainability that adjusts GNP for environmental and social costs. It indicates that while GDP may rise, genuine progress may not follow due to environmental degradation and resource depletion.

  • Environmental Policy

    • Definition: The means by which a government addresses the needs of its citizens regarding the environment.
    • Laws and regulations that define conduct in daily societal interactions with the environment.

  • How Environmental Policies Work

    • Development of environmental policies often follows a predictable cycle in democratic societies, including:
    1. Recognizing the issue.
    2. Creating policy options.
    3. Applying regulations.
    • Types of policy approaches:
      • Command & Control: Regulatory measures set by government.
      • Market Approach: Uses economic incentives (e.g., carbon tax).
      • Persuasion: Encourages behavior change through education and awareness campaigns.

Environmental Characteristics

  • Ecology

    • Focuses on organisms and their interactions with the environment, including the distribution and abundance of organisms.
    • Ecological hierarchy includes:
    1. Organism
    2. Population
    3. Biotic Community
    4. Ecosystem
    5. Landscape
    6. Biosphere
    • Limiting factors: Factors that restrict population growth as described by the Law of Limiting Factors (Liebig's Law of the Minimum).

  • Matter in Living and Nonliving Things

    • Matter is anything that occupies space and has mass, composed of atoms and molecules.
    • Biogeochemical cycling: Cycle of elements like water and oxygen through the environment.

  • Energy in Ecosystems

    • Types of energy include potential energy (stored energy).
    • Principles:
    • First Law of Thermodynamics: Energy cannot be created or destroyed.
    • Second Law of Thermodynamics: Usable energy is converted and some energy is lost at each step.

Chapter 4: Populations and Communities

  • Key Concepts in Population Dynamics

    • Definition of population: A group of individuals of the same species in a specific area.
    • Understanding population changes with the equation: population change = (births + immigration) - (deaths + emigration).
    • Concept of carrying capacity (K): The maximum population size that an ecosystem can support.
    • Blotic potential vs. environmental resistance affecting population growth.

  • Types of Survivorship Patterns

    • Density Dependence: Population growth is limited as density increases.
    • Density Independence: Populations are limited by factors independent of density.

  • Community Interaction Types

    • Symbiosis: Interaction between two species, which can be beneficial, harmful, or neutral.
    • Predation: One species benefits at the expense of another.
    • Competition: Organisms compete for the same limited resources.
    • Types of Symbiosis:
    • Mutualism: Both species benefit.
    • Commensalism: One species benefits while the other is unaffected.
    • Amensalism: One species is harmed while the other is unaffected.

  • Conservation of Biodiversity:

    • Importance of preserving biodiversity and the potential impacts of extinction on ecosystems.