Carbon Sequestration: Terrestrial & Oceanic

Active learning helps students grasp dynamic carbon sequestration processes because these systems depend on shifting balances of inputs, outputs, and feedbacks. By modeling fluxes, analyzing data, and testing assumptions, students move beyond static definitions to see carbon movement as a living, measurable system.

• Year 13
• Geography
• 4 activities
• 25 min–45 min

Learning Objectives

1. Compare the carbon storage capacities of tropical rainforests and Arctic tundra biomes, citing biomass density and decomposition rates.
2. Analyze the positive feedback loop between rising ocean temperatures and increased atmospheric CO2 release.
3. Evaluate the potential effectiveness and ethical considerations of technological carbon sequestration methods like direct air capture.
4. Explain the biological and geological pathways involved in terrestrial carbon sequestration, including photosynthesis and soil carbon accumulation.
5. Synthesize information on oceanic carbon sequestration processes, such as the biological pump and carbonate formation.

Ready-to-Use Activities

Jigsaw

⏱ 35 min·Pairs

Paired Modeling: Biome Carbon Fluxes

Pairs use diagrams and colored counters to model carbon inputs and outputs in two biomes, such as rainforest and tundra, based on provided rates for photosynthesis, respiration, and decomposition. They calculate net sequestration and graph results. Pairs then compare models with a neighbor to identify variation factors.

Prepare & details

Explain why different biomes vary so significantly in their carbon storage capacity.

Facilitation Tip: During Paired Modeling: Biome Carbon Fluxes, assign students as either ‘atmosphere’ or ‘biosphere’ to physically move labeled cards representing CO2 through their ecosystem to visualize balances.

Setup: Flexible seating for regrouping

Materials: Expert group reading packets, Note-taking template, Summary graphic organizer

• Understand
• Analyze
• Evaluate
• Relationship Skills
• Self-Management

Jigsaw

⏱ 45 min·Small Groups

Small Group Debate: Tech Interventions

Divide into small groups to research one artificial sequestration method, like ocean iron fertilization or CCS. Groups prepare pros, cons, and evidence, then debate in a structured format with timed rebuttals. Conclude with a class vote on policy priorities.

Prepare & details

Analyze how the feedback loop between warming oceans and carbon release accelerates climate change.

Facilitation Tip: In Small Group Debate: Tech Interventions, provide a cost-benefit matrix so students quantify trade-offs before discussing scalability and risks.

Setup: Flexible seating for regrouping

Materials: Expert group reading packets, Note-taking template, Summary graphic organizer

• Understand
• Analyze
• Evaluate
• Relationship Skills
• Self-Management

Jigsaw

⏱ 40 min·Small Groups

Data Stations: Ocean Feedback Loops

Set up stations with graphs of ocean temperature, pH, and CO2 data. Small groups rotate, analyze trends, and note feedback mechanisms. Each group records one key insight and shares in a whole-class synthesis.

Prepare & details

Evaluate the role technology should play in artificial carbon sequestration.

Facilitation Tip: At Data Stations: Ocean Feedback Loops, place a large printed pH scale beside each graph so students immediately connect acidity levels to ecosystem impacts.

Setup: Flexible seating for regrouping

Materials: Expert group reading packets, Note-taking template, Summary graphic organizer

• Understand
• Analyze
• Evaluate
• Relationship Skills
• Self-Management

Jigsaw

⏱ 25 min·Individual

Individual Simulation: Geological Pathways

Students individually simulate rock weathering by mixing 'CO2' solution with limestone chips, measuring mass loss over time. They log data in tables and extrapolate to global scales using provided formulas.

Prepare & details

Explain why different biomes vary so significantly in their carbon storage capacity.

Facilitation Tip: While running Individual Simulation: Geological Pathways, give each student a mini whiteboard to sketch rock weathering steps before they simulate carbon capture in a petri dish.

Setup: Flexible seating for regrouping

Materials: Expert group reading packets, Note-taking template, Summary graphic organizer

• Understand
• Analyze
• Evaluate
• Relationship Skills
• Self-Management

Teaching This Topic

Teachers should emphasize that carbon sequestration is not a single solution but a network of processes with limits. Avoid framing it as a quick fix; instead, model uncertainty by asking students to revise predictions as new data emerge. Research shows that when students manipulate physical models or data, they better retain complex feedback loops and recognize misconceptions earlier.

What to Expect

Successful learning is evident when students can explain how forests, soils, and oceans capture and release carbon, justify trade-offs between natural and technological solutions, and revise their models based on evidence. They should connect small-scale processes to global climate impacts with clarity and precision.

Watch Out for These Misconceptions

Common Misconception

During Paired Modeling: Biome Carbon Fluxes, watch for students who assume forests always absorb CO2. Redirect by asking them to adjust their flux diagrams to show mature forests in equilibrium or burned areas releasing carbon.

What to Teach Instead

Use the paired modeling cards to test their assumption. Have them add decay processes or fire events and recalculate net flux, then compare with peers to see the dynamic balance.

Common Misconception

During Data Stations: Ocean Feedback Loops, watch for students who believe oceans can absorb unlimited CO2 without consequences.

What to Teach Instead

Guide students to use the pH scale and solubility graphs to identify saturation points, then collaborate to revise a class model of ocean uptake limits.

Common Misconception

During Small Group Debate: Tech Interventions, watch for students who think artificial sequestration is a complete solution.

What to Teach Instead

Require students to use the cost-benefit matrix to quantify energy, cost, and time requirements for each technology before forming arguments, then revise their positions based on evidence.

Assessment Ideas

Discussion Prompt

After Paired Modeling: Biome Carbon Fluxes, pose the question: 'If a forest fire releases stored carbon, how might the biome recover its carbon sink status over time?' Facilitate a 5-minute peer discussion, then ask students to cite specific processes like regeneration and soil accumulation.

Quick Check

During Paired Modeling: Biome Carbon Fluxes, present students with two biome descriptions: one for a temperate grassland and one for a boreal forest. Ask them to write down three key differences in vegetation type, soil characteristics, and decomposition rates that affect carbon storage.

Exit Ticket

After Data Stations: Ocean Feedback Loops, ask students to write one sentence explaining how the 'biological pump' moves carbon from the surface to deep ocean and one sentence explaining how ocean warming might disrupt this process.

Extensions & Scaffolding

• Challenge: Ask students to design a new biome with optimal carbon storage and justify their choices using flux data from the paired modeling activity.
• Scaffolding: Provide sentence stems like, 'In the ocean, carbon moves from surface water to deep sediments through ____, which is called ____.'
• Deeper exploration: Have students research how Indigenous land management practices enhance soil carbon storage and present findings in a short video segment.

Key Vocabulary

Carbon Sequestration	The process of capturing and storing atmospheric carbon dioxide. This can occur through natural biological or geological pathways or through technological means.
Biomass	The total mass of organisms in a given area or volume. In terrestrial ecosystems, it is a key factor in determining carbon storage capacity.
Biological Pump	The process by which marine organisms, particularly phytoplankton, absorb atmospheric CO2, and this carbon is then transported to the deep ocean when organisms die or are consumed.
Solubility Pump	The process by which CO2 dissolves from the atmosphere into the surface ocean. This process is temperature dependent, with colder water dissolving more CO2.
Permafrost	Ground that remains frozen for two or more consecutive years. Thawing permafrost releases significant amounts of stored carbon as CO2 and methane.