Planet Under Pressure: How Human Actions Affect Water and Air

Materials Needed

• Notebook or digital document
• Pen or pencil
• Two clear glasses or jars
• Clean water
• Soil, sand, or cocoa powder
• A few drops of cooking oil
• Food coloring
• Ice cubes
• Optional: computer or tablet for researching a local environmental issue
• Optional: paper, colored pencils, or presentation software

Lesson Overview

Learner: Heidi, age 15

Suggested length: 60–75 minutes

Big question: How do human activities change water and the atmosphere, and what can people do to make these changes less harmful?

Learning Objectives

By the end of the lesson, Heidi will be able to:

• Explain how at least three human activities cause water or atmospheric pollution.
• Describe how pollutants move through the environment and affect living things.
• Distinguish between a pollutant, a source, an environmental effect, and a possible solution.
• Analyze a real-world pollution scenario using evidence and cause-and-effect reasoning.
• Design and justify one realistic action that could improve environmental sustainability.

Success Criteria

Success means Heidi can:

• Correctly identify the pollution source in a scenario.
• Trace at least two cause-and-effect links from human activity to environmental impact.
• Use terms such as pollutant, runoff, greenhouse gas, particulate matter, and sustainability accurately.
• Suggest a solution that is specific, realistic, and connected to the problem.

Key Vocabulary

Pollutant

A harmful substance introduced into the environment.

Runoff

Water that flows over land and carries substances into drains, rivers, lakes, or oceans.

Atmospheric pollution

Harmful gases or particles released into the air.

Particulate matter

Tiny solid or liquid particles suspended in the air, often produced by smoke, vehicles, and industry.

Greenhouse gas

A gas, such as carbon dioxide or methane, that traps heat in Earth’s atmosphere.

Sustainability

Using resources in ways that meet present needs without preventing future generations from meeting theirs.

Introduction: The Planet Detective Challenge

Time: 10 minutes

Ask Heidi to imagine this situation:

After a heavy rainstorm, a nearby stream becomes cloudy. Fish begin disappearing, and there is a strange smell in the water. At the same time, traffic in the area increases, and the air looks hazy. What might be happening?

Invite Heidi to make a quick list of possible causes. Do not correct every idea yet. Explain that during the lesson she will act as an environmental detective by identifying sources, tracking pollutants, and designing solutions.

Share the learning objectives in student-friendly language:

• “You will investigate how people change water and air.”
• “You will connect human actions to environmental effects.”
• “You will create a practical sustainability solution.”

Quick prediction: Ask Heidi to answer in her notebook:

1. Which human activities do you think cause the most water pollution?
2. Which activities cause the most air pollution?
3. Can pollution affect people who did not cause it? Explain.

Body Part 1: I Do — Modeling Cause and Effect

Time: 15 minutes

Explain that environmental problems can be analyzed using four questions:

1. What is the human activity?
2. What pollutant is released?
3. What happens in the environment?
4. What could reduce the harm?

Example A: Water Pollution from Runoff

Model the following chain:

Excess fertilizer on a farm or lawn → rain carries nitrogen and phosphorus into a pond → algae grow rapidly → algae use up oxygen as they decompose → fish and other aquatic organisms may die.

Explain that this process is called eutrophication. It can create a “dead zone,” an area with too little oxygen for many organisms to survive.

Example B: Atmospheric Pollution from Vehicles

Model a second chain:

Burning gasoline or diesel → releases carbon dioxide, nitrogen oxides, and particulate matter → contributes to climate change, smog, or respiratory problems → affects human health and ecosystems.

Clarify that different pollutants create different problems. Carbon dioxide is a greenhouse gas, while particulate matter can enter the lungs and worsen breathing conditions.

Formative Check

Ask Heidi:

• What is the pollution source in the fertilizer example?
• How does runoff connect land activities to water pollution?
• Why are pollutants not always visible?
• What is one difference between a greenhouse gas and particulate matter?

Body Part 2: We Do — Pollution Investigation

Time: 15–20 minutes

Activity: Build a Pollution Model

Use two clear jars to represent bodies of water.

1. Fill both jars with clean water.
2. In the first jar, add a small amount of soil or sand. Explain that this represents sediment carried by runoff.
3. Add one drop of food coloring to represent a dissolved pollutant.
4. Add one drop of cooking oil to represent oil pollution from roads, parking areas, or spills.
5. Place an ice cube in the second jar and explain that it represents a cleaner water system for comparison.
6. Observe and record differences in appearance, smell, and floating materials.

Safety note: Do not drink the water. Wash hands after the activity. Dispose of the mixture properly and avoid pouring oil down a drain.

Discussion Questions

• Which materials stayed on the surface, dissolved, or settled at the bottom?
• Would a water treatment plant need to remove each material in the same way?
• Could a waterway look clean but still contain harmful dissolved chemicals?
• What real-world activities could introduce each material into water?

Explain that pollutants can enter water from:

• Farms and lawns through fertilizer or pesticide runoff
• Factories through industrial discharge
• Roads through oil, heavy metals, and other residues
• Homes through improperly disposed chemicals, medicines, or plastics
• Wastewater systems through sewage or untreated wastewater

Body Part 3: We Do — Air Pollution Simulation

Time: 10 minutes

Ask Heidi to stand in an open area or imagine a town with four locations: a highway, a factory, a neighborhood, and a park. Read each source aloud and have Heidi move toward the location most likely to be affected.

• Vehicle exhaust: releases nitrogen oxides, carbon monoxide, carbon dioxide, and particulate matter.
• Coal or gas power plants: release greenhouse gases and, depending on the fuel and controls, other air pollutants.
• Wildfires or burning waste: release smoke and fine particles that can affect breathing.
• Agriculture and landfills: can release methane, a powerful greenhouse gas.

Explain that air pollution can travel. Wind may carry pollution away from its source, so people far from the original activity may still be affected.

Think-Pair-Share

Heidi first thinks independently, then explains her answer aloud to a partner, family member, or instructor. If working alone, she can record a one-minute voice note.

Prompt: “Which air pollution source would be hardest to solve, and why?”

Body Part 4: You Do — Environmental Detective Case Files

Time: 15–20 minutes

Choose one case file. Heidi should complete the analysis table in her notebook.

Case File A: The Green Lawn Problem

A neighborhood uses large amounts of fertilizer. After heavy rain, a nearby lake develops thick green algae. Fish are later found near the surface, gasping for air.

Case File B: The Busy Road

A new highway increases traffic near a town. Residents report more coughing during periods of still air. A monitoring station records increased particulate matter.

Case File C: The Plastic Creek

Plastic packaging and other trash collect in a creek after storms. Animals become trapped in some items, and small pieces of plastic are found downstream.

Case File D: The Factory and the Wind

A factory releases gases from its smokestack. On windy days, a community several miles away experiences a noticeable haze and unpleasant smell.

Analysis Table

Question	Heidi's Response
What human activity is involved?
What pollutant or pollutants may be present?
How could the pollutant move through the environment?
Who or what could be affected?
What evidence supports your explanation?
What is one realistic solution?

Body Part 5: You Do — Design a Sustainability Solution

Time: 15 minutes

Heidi chooses one problem from the case files or investigates a local issue such as water waste, litter, traffic pollution, food waste, or energy use.

She creates one of the following:

• A one-page campaign poster
• A short public service announcement script
• A three-slide digital presentation
• A household or community action plan
• A simple design for a pollution-reduction device, such as a rain garden or improved storm drain filter

The project must include:

1. A clearly stated environmental problem
2. The human activity causing or worsening the problem
3. At least one specific pollutant
4. Two effects on people, organisms, or ecosystems
5. One short-term and one long-term solution
6. A reason the proposed solution is realistic and sustainable

Possible Solutions

• Planting vegetation beside waterways to slow runoff
• Using fertilizer more carefully and avoiding application before heavy rain
• Choosing walking, cycling, public transportation, or carpooling when possible
• Improving energy efficiency and using renewable energy sources
• Reducing single-use plastics and improving recycling systems
• Maintaining vehicles to reduce harmful exhaust
• Installing pollution controls in factories
• Protecting wetlands, which can filter water and provide habitat

Assessment

Formative Assessment

• Prediction questions during the introduction
• Vocabulary checks during direct instruction
• Observations from the water pollution model
• Think-pair-share responses about air pollution
• Teacher, parent, or self-feedback during the case-file activity

Summative Assessment: Pollution Solution Project

Evaluate the final project using this four-point rubric:

Criteria	4 — Strong	3 — Secure	2 — Developing	1 — Beginning
Scientific accuracy	Explains pollution and effects accurately with precise vocabulary.	Mostly accurate explanation with minor errors.	Includes some accurate information but has important gaps.	Explanation is unclear or mostly inaccurate.
Cause and effect	Clearly traces multiple links from activity to environmental impact.	Explains a clear cause-and-effect connection.	Connection is partly explained.	Cause and effect are missing or confused.
Solution quality	Solution is specific, realistic, creative, and well justified.	Solution is realistic and connected to the problem.	Solution is general or only partly connected.	Solution is missing or impractical.
Communication	Information is organized, engaging, and easy to understand.	Information is organized and understandable.	Some ideas are difficult to follow.	Project is incomplete or unclear.

Differentiation and Adaptations

Support for Learners Who Need Scaffolding

• Provide a cause-and-effect sentence frame: “When people ______, they release ______. This can cause ______ because ______.”
• Allow Heidi to choose from a vocabulary word bank.
• Use only one case file and complete the first row of the table together.
• Permit an audio recording instead of a written response.
• Review one water pollution example and one air pollution example before independent work.

Extensions for Advanced Learning

• Compare point-source pollution, which comes from an identifiable source, with nonpoint-source pollution, which comes from many scattered sources.
• Research a local water-quality or air-quality report and evaluate its evidence.
• Compare the costs and benefits of two possible solutions.
• Investigate environmental justice by asking whether pollution affects all communities equally.
• Calculate a rough household carbon or water-use footprint and recommend changes.

Flexible Learning Formats

• Homeschool: Discuss findings with a parent or mentor and investigate a nearby stream, road, or park.
• Classroom: Work in teams, assigning roles such as researcher, evidence checker, designer, and presenter.
• Training or online setting: Use a shared document, digital whiteboard, or recorded presentation.

Conclusion: Tell What You Learned

Time: 5–10 minutes

Return to the opening question about the cloudy stream and hazy air. Ask Heidi to explain the situation using the lesson’s vocabulary.

Have Heidi complete these exit-ticket prompts:

1. One human activity that changes water quality is ______.
2. One human activity that changes air quality is ______.
3. One important pollutant is ______, and it can ______.
4. One solution I could support at home or in my community is ______.
5. One question I still have is ______.

Key Takeaways

• Human activities can release pollutants into water and the atmosphere.
• Pollution can move through runoff, wind, food webs, and water systems.
• Environmental effects may include disease, habitat damage, climate change, reduced biodiversity, and unsafe water or air.
• Sustainable solutions reduce pollution at its source, protect ecosystems, and consider the needs of both present and future generations.

Optional Follow-Up Challenge

For one week, Heidi records examples of possible pollution or resource waste near her home. She should note the location, likely source, possible environmental effect, and one realistic solution. At the end of the week, she chooses the most important observation and turns it into a short action proposal.