Human Impact on Earth Systems: Evaluating Environmental Solutions

Human Impact on Earth Systems: Evaluating Environmental Solutions

Grade 11 · Science · NYSSLS HS-ESS3-4 · 60 Minutes

NYS-Aligned Standard

HS-ESS3-4 — Evaluate or refine a technological solution that reduces impacts of human activities on natural systems. NYS P-12 Science Learning Standards / NYSSLS (2017)

Three-Dimensional Alignment

Learning Objectives — “I Can” Statements

• I can identify ways human activities negatively impact natural systems.
• I can evaluate technological solutions using criteria: effectiveness, feasibility, cost, side effects.
• I can use evidence to construct an argument for the best available solution to a specific environmental problem.

Essential Question

When human activities damage the environment, how do we evaluate whether a technological solution actually helps?

NYS-Specific Context

This lesson focuses on Hudson River PCB contamination — a real and well-documented environmental issue in New York State. The contamination, caused by industrial discharge, has been the subject of decades of cleanup efforts. This provides NYS-relevant, real-world context without using any copyrighted texts.

Note: Students research general facts; no specific company, legal case, or political position is required or advocated. The lesson focuses on evaluating cleanup technologies scientifically.

Lesson Sequence

Hook (8 min)

1. Present a simplified data table showing PCB levels in Hudson River fish tissue over time (teacher-created, using publicly available general trend data without copyrighted graphs).
2. Ask: “What trend do you see? When did cleanup efforts begin? Are they working?”
3. Bridge: “Scientists and engineers have proposed and tested multiple solutions. Today we evaluate them.”

Direct Instruction (12 min)

1. Overview of the problem: PCBs (polychlorinated biphenyls) are synthetic chemicals; they accumulate in tissue (bioaccumulation) and magnify up food chains (biomagnification)
2. Present 3 solution approaches (teacher-authored descriptions):
   • Dredging: Physically removing contaminated sediment from the river bottom
   • Monitored Natural Recovery (MNR): Allowing natural processes to bury and break down PCBs over time
   • Bioremediation: Using microorganisms to break down PCBs in contaminated areas
3. Introduce the Evaluation Framework: effectiveness / feasibility / cost / ecological side effects / timeline

Evaluation Task (22 min)

1. Groups assigned one solution; research using provided fact sheets (teacher-created, not copyrighted)
2. Complete Solution Evaluation Matrix
3. Groups present: “Our solution is best/not best because [evidence] + [criterion].”
4. Class votes and justifies using the evaluation framework

Closure (8 min)

1. Debrief: “Did any one solution win on ALL criteria? Why is this complicated?”
2. Connect: “This is how real environmental engineers and policymakers think.”
3. Exit ticket: “Name one criterion that makes evaluating environmental solutions harder than evaluating a product you buy at a store.”

Solution Evaluation Matrix

Name: ___________________ Solution: __________________ Date: _________

Criterion | Rating (1–4) | Evidence / Explanation
Effectiveness | | 
Ecological side effects | | 
Cost / feasibility | | 
Timeline to results | | 
Community/human impact | | 

Overall recommendation: ___________________________________________________
Trade-offs of my solution: ___________________________________________________

SDI & Differentiation Block

Supports for MLLs/ELLs

Entering/Emerging (NYSESLAT Levels 1–2):

• Provide a simplified bilingual fact sheet for each solution (key terms in both languages)
• Vocabulary: contamination, sediment, bacteria, cost, effective, ecological
• Allow student to complete the matrix with bullet points or drawings
• Sentence frame: “This solution is effective because ___. A problem with it is ___.”

Transitioning/Expanding (NYSESLAT Levels 3–4):

• Academic frame for argumentation: “I recommend ___ because the evidence shows ___. The main trade-off is ___.”
• Pre-teach scientific vocabulary before the lesson using a visual glossary

Supports for Students with IEPs

SDI Adaptation Dimensions: content, methodology, delivery

• Content: Focus on evaluating 2 solutions (not 3); provide a pre-filled partial matrix for one solution as a model
• Methodology: Use visual rating scales (thumbs up/neutral/down) for criterion ratings before writing; provide sentence starters for the recommendation
• Delivery: Provide fact sheets with highlighted key sentences; extended time per IEP; allow verbal group contribution

Suggested Placement: ICT

Answer Key / Model Response

Exit ticket model: “Environmental tradeoffs are harder because natural systems are interconnected — a solution that reduces one impact might create another, and effects may take decades to measure. There’s no ‘product recall’ if a solution causes unintended harm to the ecosystem.”

Alignment Record