Human Impact Biodiversity

Overview

In this lesson, students investigate how human activities affect biodiversity, focusing on urbanization, pollution, and deforestation. They connect causes to changes in habitats and populations, and propose practical actions to reduce harm.

Learning intentions

• Students will be able to describe ways human activities can change ecosystems and biodiversity.
• Students will be able to explain how urbanization, pollution, and deforestation affect habitats and living things.
• Students will be able to use evidence from data or a short case study to support a claim about biodiversity impacts.
• Students will be able to communicate solutions that help protect biodiversity.

Success criteria

• I can identify how each human activity (urbanization, pollution, deforestation) impacts habitats and species.
• I can link cause and effect using specific examples and key vocabulary (habitat, population, biodiversity).
• I can support my claim with evidence from an observation, text, or data set.
• I can suggest at least one realistic action to reduce human impact and explain how it would help.

Curriculum links

• Ontario Science learning outcomes for grade 6 about understanding interactions between living things and the environment.
• Scientific inquiry skills: asking questions, gathering and recording information, and using evidence to make explanations.
• Communication skills: expressing ideas clearly using scientific language and appropriate representations.
• Environmental responsibility through understanding the effects of human actions on ecosystems.

Lesson structure (45 minutes)

1. 0–5 min: Hook and focus question Show three quick images (urban area expansion, polluted water/land, logged/cleared forest). Ask: “How do human choices change the variety of living things in an area?”

2. 5–12 min: Mini-lesson—three major impacts Briefly teach the cause-and-effect chain for each:

• Urbanization: less green space, habitat fragmentation, more light/noise, changes to water runoff.
• Pollution: toxins or excess nutrients harm organisms, reduce oxygen, and contaminate food webs.
• Deforestation: removal of shelter and food, loss of breeding areas, increased erosion and climate effects. Emphasize that biodiversity includes variety of species and healthy ecosystems.

3. 12–25 min: Investigate case studies (small groups) Put students in groups of 3–4. Give each group a short printed case study or data card (teacher-prepared) with a claim prompt. Each card should include simple evidence (e.g., before/after species counts, habitat description, water quality indicator, or a timeline of land-use change). Students record:

• What human activity is shown?
• What changes happen to habitat or resources?
• Which living things are affected (or might be affected)?
• One piece of evidence that supports a claim.

4. 25–33 min: Whole-class synthesis using a “cause–effect–biodiversity” chart As groups share, add their ideas to a class chart with three columns: Human activity → Habitat/resource changes → Biodiversity impact (species/populations/ecosystem). Prompt students to connect impacts to either fewer species, changes in populations, or disrupted relationships (food chains, shelter, breeding).

5. 33–40 min: Solution planning—“What can we do?” Students choose one impact area and propose a realistic action (e.g., protecting green spaces, reducing litter and runoff, responsible land management, reforestation with native species, using filtration/water treatment, community clean-ups). They write a short response: “Our action could help by…” linking back to the cause-and-effect they studied.

6. 40–45 min: Exit ticket Students complete a quick exit ticket:

• One sentence: identify the most important cause-effect relationship they learned.
• One sentence: name one action to reduce human impact and explain how it supports biodiversity.

Resources

• Teacher-prepared case study cards or data sheets (urbanization, pollution, deforestation) with short evidence.
• Image slides or printed pictures showing each human impact.
• Class cause–effect–biodiversity chart paper or board.
• Student science notebooks or worksheets with a recording organizer.
• Coloured markers for class chart updates.
• Exit ticket slips (one per student).
• Reference word bank (habitat, biodiversity, population, pollution, deforestation, urbanization, evidence, claim, cause, effect).

Assessment

• Formative: teacher observes group discussions and checks organizers for accurate cause–effect links.
• Formative: review the cause–effect–biodiversity chart contributions for correct scientific language and evidence use.
• Summative (short): exit tickets to assess understanding of impacts and one feasible mitigation action.

Differentiation

• Support: provide sentence starters for group claims (“The human activity changes… which affects…”) and include a simplified evidence section on cards.
• Support: pre-teach or reinforce key vocabulary with quick examples and non-examples (e.g., “habitat is where a living thing gets food, water, and shelter”).
• Extension: ask students to compare two case studies and predict which biodiversity impact might be most severe and why; or to propose a monitoring method (simple observations) to track change.
• EAL/SEN: allow visuals (icons, arrows) on organizers; offer an audio read-aloud of case studies; provide a smaller chunk of text and more guided prompts.