Comprehensive Notes: Understanding Our Environment - Chapter 1 Notes
Course Objectives
Demonstrate an understanding of the key biological and physical systems that influence the Earth’s environment.
Explain how humans are changing the environment and describe the impacts of those changes.
Evaluate policies and other interventions that can be used to mitigate the impacts of human activity.
Use Excel to analyze and graph environmental data sets.
Demonstrate an ability to use quantitative information to evaluate human-natural system change.
Textbook and Course Context
Text: Environmental Science: A Global Concern, 16th edition by Cunningham et al.
Authors: William P. Cunningham, Mary Ann Cunningham, Catherine M. O’Reilly, Katherine E. Winsett.
Course framing: Introduction to environmental science and environmental studies, with emphasis on systems thinking, sustainability, ethics, and policy.
What is Environmental Studies and Science?
Environmental Studies/Science integrates natural sciences, social sciences, and humanities to understand human–environment interactions.
Focus on solving environmental problems created by humans and understanding human place within the environment.
The Rock Cycle (Key Processes and Pathways)
Rock cycle components illustrated:
Magma cooling forms igneous rocks: intrusive (plutonic) and extrusive (volcanic).
Weathering and erosion break rocks into sediment.
Sedimentary rocks form through burial, compaction, and cementation of sediments.
Metamorphic rocks arise from deeper burial, heat, and pressure.
Uplift brings rocks back toward the surface; transport and deposition distribute sediments.
Cycle emphasis: interconnected transformations among igneous, sedimentary, and metamorphic rocks driven by tectonics, burial, and surface processes.
Rocks, Mountains, and Human Perspective
Mountains symbolize enduring, immovable natural features from a human perspective.
They are powerful symbols of quiet endurance and stability in many cultural contexts.
Sands of Time: Sand as a Global Resource (Key Points)
Sand samples can be distinguished by origin using techniques such as Broad Acoustic Dissolution Spectroscopy (BADS).
Sand and related aggregates are major global commodities with significant extraction pressures.
Mechanics of Sand Sound Recovery (Acoustic Analysis Example)
Experimental setup: scoop of sand dropped into a beaker of mildly acidic solution; carbonate minerals react to release CO₂, producing gas that changes liquid compressibility and the sound transmission characteristics.
Observations during mixing:
Gas production lowers frequency of sound through the liquid as reaction proceeds.
After carbonate breakdown completes, gas production slows and the sound frequency returns toward the original.
Outcomes for each sand sample:
Measure how quickly the pitch changes (rate of change).
Measure the magnitude of the pitch change (extent of change).
Sand as a Global Resource: Demand and Urban Growth
After water, sand and gravel are among the most-used natural materials globally.
UNEP data: sand and gravel account for up to of all mined materials worldwide per year.
China accounts for a large share of global demand.
Projections: by 2030, there will be over megacities (more than 10 million inhabitants) up from 31 in 2016.
Global extraction: the world uses nearly tonnes of sand and gravel per year—almost twice as much as a decade ago.
Other resources: Sand is one of the most traded and mined commodities aside from water.
Knowledge, Perspectives, and Sustainable Development
Environmental science draws on multiple kinds of knowledge and historical perspectives.
Core concepts include sustainable development, ethics, and the interplay of scientific and human dimensions.
Emphasis on interdisciplinary and integrative approaches spanning natural sciences, social sciences, and humanities.
Core Concepts: Interdisciplinary Thinkers and Systems View
Humans inhabit both natural and social worlds; environments are defined as:
Circumstances or conditions surrounding an organism or group of organisms.
A complex of social conditions that affect individuals or communities.
Interactions occur across several domains:
Social patterns and processes (demography, technology, economy, institutions, culture, information).
External political and economic conditions.
Land use and land cover (human systems).
Production, consumption, and disposal (consumption and waste).
Natural biogeophysical conditions and ecological processes (primary production, nutrients, disturbance).
Environmental Indicators and Observational Skills
In-Chapter Exercise (Chapter 1): Select images and identify observable environmental indicators.
Task: List physical, biological, and human elements evident in provided images; develop observational and inferential skills.
Drivers and Scope: Systemic View of Change
Slide 21 framework identifies multiple drivers of environmental change:
(A) Global biotic and abiotic drivers: Temperature, Precipitation, Human movement.
(B) Anthropogenically modified biotic drivers: Habitat connectivity/size, Human population, Diversity of exotic species, Presence of predators, Food availability.
(C) Cultural and socioeconomic drivers: Income, Environmental policy, Population, Human movement, Carbon emissions, Education.
(D) Anthropogenically modified abiotic drivers: Urban cover, Carbon emissions, Density of railways/freeways, Noise, light, chemical pollution, Climate harshness.
(E) Ecological processes: Population dynamics (predation, reproduction, dispersal), Competition, Disease, Community structure (trophic cascades, interspecific interactions), Movement/dispersal.
(F) Evolutionary processes: Gene flow, Genetic drift, Population size, Mutation, Speciation/Hybridization, Novel species, Species recognition, Natural selection.
(G) Urban biodiversity: Species diversity, Functional diversity, Genetic diversity, Ecosystem diversity.
Three principles (Slide 22):
1) Level of connectivity: extent to which green spaces are joined up.
2) Degree of naturalness: how close flora/fauna are to pre-settlement conditions.
3) Structural diversity: complexity and variety of flora and fauna.
Introduction 2: Interdisciplinary Nature of Environmental Science
Environmental science is the systematic study of our environment and our place in it.
Emphasizes interdisciplinarity: Natural sciences, social sciences, and humanities.
Focus on understanding and solving environmental problems created by humans.
Knowledge in Different Domains and the Challenge of Sustainable Development (Figure 1.2)
Knowledge domains contributing to environmental science include:
Economics: Incentives for resource protection.
Anthropology and Religion: Values toward nature.
Arts and Humanities: Narratives shaping ideas about other species.
Policy: Tools to protect people, other species, and the environment.
Ecology: How ecosystems function.
Earth Science: Influences on climate, water, and soils.
Chemistry: Pollutant transport and transformation in ecosystems.
Sustainable development requires integrating these domains to balance ecological health with human well-being.
From Human–Nature Dualism to Integrated Socio-Ecosystems (Figure 1.3-like discussion)
Four broad visions of the relationship between humans and nature:
Hierarchy and integration by fields: humans often seen as superior to nature (dualistic view).
Equivalence: humans and nature treated as equivalent with mutual respect.
Separate with unilateral influence: one side influences the other more but not symbiotic.
Deeply interacting and interdependent: humans and nature coevolve and influence each other.
This spectrum frames how different research fields frame environmental problems and solutions.
In-Lecture Exercise 1: Assessing Research Fields for Real-World Problems
Five real-world scenarios (brief summaries):
Scenario 1: Timber quota and sustainable yield in a public forest; identify the best-suited research field to determine maximum sustainable yield.
Scenario 2: Dam conflict across countries; analyze the interdisciplinary needs and the field best suited to address cross-border dissensus.
Scenario 3: Coral reef decline involving climate change, runoff, and overfishing; identify integrative field capable of addressing interconnected drivers.
Scenario 4: Urban coyote management, cultural perceptions, and coexistence ethics; explore the field best for the cultural dimension.
Scenario 5: Fragmented forest due to suburban expansion; design landscape-scale ecological connectivity and plan to maintain ecological processes.
Purpose: Map problems to appropriate research domains and justify using the axes of hierarchy vs equivalence and degree of integration.
Major Themes in Environmental Science (Slide 42)
Population and resource consumption: global population around ; per-person resource use.
Hunger and food distribution: inequities in global food access.
Biodiversity loss: rapid species declines.
Energy: fossil fuels cause pollution; transition to renewable energy.
Air pollution: deteriorating air quality in many regions.
Water resources: critical for ecosystems and human needs.
Information and education: essential for environmental problem-solving and action.
Signs of Hope and Progress (Slide 43-46)
Some positives in population trends, pollution control, health, education, habitat protection, and renewable energy adoption.
Cap-and-trade and carbon markets as policy tools to limit emissions.
International cooperation with environmental protection agreements, with mixed enforcement effectiveness.
Historical Perspective: Four Stages of the Environmental Movement
Stage 1: Pragmatic Resource Conservation (George Perkins Marsh; influenced Roosevelt and Pinchot).
Pinchot’s policy: Pragmatic Utilitarian Conservation – "greatest good for the greatest number for the longest time".
Legacy in U.S. Forest Service’s multiple-use policies.
Stage 2: Ethical and Aesthetic Nature Preservation (John Muir, biocentric preservation; Aldo Leopold).
Muir argued nature deserves existence for its own sake, not just for use to humans.
Leopold’s Land Ethic: we abuse land because we treat it as a commodity; emphasis on ethical relationships to land.
Stage 3: Modern Environmental Movement (post-WWII industrial expansion; Rachel Carson’s Silent Spring (1962); Bill McKibben; Wangari Maathai).
Carson highlighted pesticides and ecological/health threats; sparked public concern.
McKibben and Maathai contributed to climate action and grassroots environmental justice.
Stage 4: Global Environmentalism (rise of information technology enabling broader connectivity and impact of local leaders worldwide: Wangari Maathai, Yu Xiaogang, Gro Brundtland, Greta Thunberg).
Notable Figures and Resources
Rachel Carson: Silent Spring (1962) and influence on environmental awareness.
Wangari Maathai: Green Belt Movement; environmental restoration and social justice.
Theodore Roosevelt, Gifford Pinchot, John Muir, Aldo Leopold: foundational ideologies of conservation, preservation, and ecological ethics.
Greta Thunberg and other global climate leaders.
The Divided World: Inequality and Environmental Burdens (Slides 42-45)
Poverty and environmental degradation are closely linked; 700 million people live below the international poverty line ( < frac{1}{2} ext{?} ext{- see note}
Clarification: World Bank estimates show around people live below .
Wealth inequality: Large gaps between high-income and middle/low-income countries influence environmental outcomes and access to resources.
Wealth–pollution relationship (Environmental Kuznets-like pattern): pollution tends to rise with wealth at early stages of development and may decrease as wealth increases, but some burdens shift from local to global and from immediate to delayed impacts.
U.S. consumption context: the U.S. comprises about of world population but accounts for roughly of oil production, of global CO₂ emissions, and about of toxic wastes globally.
If all of China’s population matched American consumption, planetary resources would be insufficient (roughly the equivalent of several additional Earths).
Sustainable Development and its Debates
Definition: "Meeting the needs of the present without compromising the ability of future generations to meet their own needs" (Brundtland, 1987).
Key requirements: Benefits should be available to all humans; economic growth alone is not sufficient.
Divergent views on growth: some ecologists argue continual growth is unsustainable due to finite resources and waste absorption limits; others argue technology and social organization can enable long-term, though not infinite, growth.
Indigenous Peoples, Rights, and Knowledge
Indigenous peoples are often the most marginalized yet hold keys to biodiversity through traditional knowledge and stewardship of lands.
Language preservation and land rights as ecological safeguards; land stewardship can support ecological integrity.
Environmental Ethics & Worldviews
Ethics define what is right or wrong in actions regarding the environment.
Worldviews influence how we value nature and our moral obligations to other beings and future generations.
Scope of moral consideration can extend beyond self to family, humanity, sentient animals, all life, and the world.
Values and Moral Considerations in Environmental Decision-Making
Moral Extensionism: extending moral consideration to non-human life and ecosystems; debate over intrinsic vs instrumental value.
Inherent (intrinsic) value: entities have right to exist independent of usefulness.
Instrumental value: value assigned for usefulness to humans or other beings.
Scope of moral consideration: typically starts with self and expands outward to include others and the biosphere.
Religious Traditions and Stewardship
Stewardship: many religious traditions promote responsible care for resources and the environment.
Environmental stewardship is increasingly promoted by faith-based organizations as part of global conservation efforts.
Environmental Justice, Racism, and Toxic Colonialism
Environmental Justice: civil rights approach to ensuring safe, healthy environments for all, with attention to minorities bearing disproportionate health and environmental risks.
Environmental Racism: inequitable distribution of environmental hazards based on race (e.g., lead poisoning risks in communities with aging infrastructure; Black children facing higher risk than white children in the U.S.).
Toxic Colonialism: targeting poor communities or communities of color in developing nations as sites for hazardous waste disposal; short-term economic incentives may overwhelm long-term ecological and health considerations.
Ecosystem Services (Provisioning, Regulating, Supporting)
Ecosystem services categories:
Provisioning: Food and fuel, water, medicines, etc.
Supporting: Photosynthesis, nutrient cycles, soil formation, biodiversity maintenance.
Regulating: Carbon sequestration, climate regulation, flood control, pest management.
Supporting/Regulating: Water purification by streams and soil bacteria; temperature regulation by water bodies.
Importance: Ecosystem services underpin human well-being by providing resources, maintaining environmental health, and supporting economic and social systems.
Sustainable Development Goals (SDGs)
The 17 SDGs (examples):
1 No poverty
2 Zero hunger
3 Good health and well-being
4 Quality education
5 Gender equality
6 Clean water and sanitation
7 Affordable and clean energy
8 Decent work and economic growth
9 Industry, innovation, and infrastructure
10 Reduced inequalities
11 Sustainable cities and communities
12 Responsible consumption and production
13 Climate action
14 Life below water
15 Life on land
16 Peace, justice, and strong institutions
17 Partnerships for the goals
Numerical and Quantitative References (Key Stats Recapped)
Global population: people.
Extreme poverty line used in many contexts: <\$1.90\text{ per day} (international poverty line).
Sand and gravel share of mining: up to of mined materials annually.
Urban megacities by 2030: about (40) megacities with populations > 10 million.
Global sand and gravel use: .
U.S. share in population: ; oil production: ; CO₂ emissions: ; toxic wastes: .
If China’s residents matched U.S. consumption levels, the world would require approximately several additional Earths (illustrative scale, not a single numeric value here).
Summary of Implications and Applications
Environmental science demands integration across disciplines to address real-world problems such as resource use, pollution, climate change, and social equity.
Ethical considerations (moral value of nature, justice, and indigenous rights) shape policy choices and governance.
The evolution of environmental thought from resource conservation to global environmentalism reflects changing scales of action and the role of technology and communication.
Practical actions include policy development, sustainable development planning, ecosystem restoration, and culturally informed stewardship.