AP Environmental Science Cram Sheet

AP Environmental Science explores the complex interactions between humans and the natural world, focusing on environmental problems, their causes, and potential solutions. It covers ecological principles, Earth systems, human impacts, and sustainability.

Core Principles

• Ecosystem structure and function
• Biodiversity and its importance
• Population dynamics and carrying capacity
• Earth's systems (atmosphere, hydrosphere, lithosphere, biosphere)
• Human population growth and its impacts
• Resource use and conservation
• Pollution and its control
• Climate change and global warming
• Land and water use impacts
• Sustainability and environmental policy

Action Steps

• Understand the interconnectedness of all environmental systems.
• Identify the major sources and impacts of pollution.
• Analyze population growth patterns and their consequences.
• Evaluate the sustainability of resource use.
• Learn key ecological terms and concepts.
• Study major environmental legislation and international agreements.
• Practice interpreting graphs and data related to environmental issues.
• Connect concepts across different units to see the bigger picture.
• Review case studies and real-world examples.
• Master the format of multiple-choice and free-response questions.

Formulas

• Population Growth Rate: $ \frac{(Births - Deaths) + (Immigration - Emigration)}{Total Population} \times 100 $
• Doubling Time (Rule of 70): $ \frac{70}{Percent Growth Rate} $
• Carrying Capacity (K): Maximum population size an environment can sustain
• Survivorship Curves: Type I (high survival, low mortality), Type II (constant mortality), Type III (low survival, high mortality)
• Biomass: Total mass of organisms in a given area or ecosystem
• Net Primary Productivity (NPP): Gross Primary Productivity (GPP) - Respiration (R)
• Energy Transfer Efficiency (10% Rule): Only about 10% of energy is transferred to the next trophic level

Key Terms

• Ecosystem: A community of living organisms (biotic) interacting with their non-living environment (abiotic).
• Biodiversity: The variety of life in the world or in a particular habitat or ecosystem, including genetic, species, and ecosystem diversity.
• Carrying Capacity (K): The maximum population size of a biological species that can be sustained by that specific environment, given the available resources.
• Trophic Level: The position an organism occupies in a food chain (e.g., producer, primary consumer, secondary consumer).
• Greenhouse Effect: The process by which radiation from the sun is absorbed by greenhouse gases in Earth's atmosphere, warming the planet.
• Sustainable Development: Development that meets the needs of the present without compromising the ability of future generations to meet their own needs.
• Pollution: The introduction of harmful substances or products into the environment.
• Biogeochemical Cycle: The pathway by which a chemical substance moves through biotic and abiotic compartments of Earth (e.g., carbon cycle, nitrogen cycle).
• Keystone Species: A species on which other species in an ecosystem largely depend, such that if it were removed, the ecosystem would change drastically.
• Eutrophication: The excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.

Pro Tips

• Always define terms clearly in free-response questions.
• Use specific examples to support your answers.
• Draw connections between different units whenever possible.
• Pay attention to units and calculations.
• Understand the difference between weather and climate.
• Recognize the impact of human activities on natural systems.
• Focus on cause-and-effect relationships.
• Practice interpreting graphs, charts, and diagrams.
• Know the major environmental laws and international treaties.
• Think about solutions and mitigation strategies.

Pitfalls to Avoid

• Confusing correlation with causation.
• Not providing enough detail or specific examples.
• Misinterpreting graphs or data.
• Forgetting to define key terms.
• Making vague or general statements.
• Not addressing all parts of a free-response question.
• Underestimating the importance of biodiversity.
• Ignoring the role of human population growth.
• Failing to connect local issues to global impacts.
• Not understanding the 10% energy transfer rule.

Myth vs Reality

• Recycling solves all our waste problems.: While important, recycling is only one part of waste management. Reducing consumption and reusing items are more effective strategies. Recycling also has energy costs and limitations.
• Climate change is just a natural cycle.: While Earth's climate has changed naturally, the current rapid warming trend is overwhelmingly attributed to human activities, primarily the emission of greenhouse gases.
• Biodiversity loss only affects remote rainforests.: Biodiversity loss occurs everywhere and impacts local ecosystems, agriculture, and human health through loss of ecosystem services like pollination and clean water.

Real World Examples

• Overfishing in the Pacific Ocean: Illustrates population dynamics, carrying capacity, and the impact of human resource extraction on marine ecosystems. Leads to species decline and ecosystem imbalance.
• The Dust Bowl in the 1930s USA: Demonstrates the consequences of unsustainable agricultural practices (over-plowing, monoculture) leading to soil erosion, desertification, and massive ecological and social disruption.
• Acid Rain in North America and Europe: A clear example of transboundary pollution (SO2 and NOx emissions) impacting ecosystems, infrastructure, and human health, leading to international environmental agreements.
• The Montreal Protocol: A successful international treaty aimed at phasing out the production of substances responsible for ozone depletion, showcasing effective global cooperation on environmental issues.

Timeline

• 1969: First Earth Day proposed.
• 1970: First Earth Day celebrated; EPA established in the US.
• 1973: Endangered Species Act passed in the US.
• 1987: Montreal Protocol signed to protect the ozone layer.
• 1997: Kyoto Protocol adopted to address climate change.
• 2015: Paris Agreement adopted to combat climate change.

People

• Rachel Carson: Author of 'Silent Spring', credited with launching the modern environmental movement.
• Al Gore: Prominent advocate for climate change awareness, author of 'An Inconvenient Truth'.
• Jane Goodall: Primatologist and anthropologist, renowned for her work with chimpanzees and conservation efforts.

Quiz

• Which trophic level contains organisms that produce their own food?: Producer
• The 'Rule of 70' is used to estimate:: Population doubling time
• Which of the following is a non-point source of pollution?: Agricultural runoff
• What is the primary cause of ozone depletion?: Chlorofluorocarbons (CFCs)
• Which type of survivorship curve shows a constant death rate over time?: Type II
• What does NPP stand for in ecology?: Net Primary Productivity
• Which of these is an example of a keystone species?: Sea Otter
• Eutrophication is primarily caused by excess:: Nitrogen and Phosphorus
• Which international agreement aims to reduce greenhouse gas emissions?: Both Kyoto Protocol and Paris Agreement
• What is the main goal of sustainable development?: Meet present needs without compromising future generations