Science · Grade 6 · Environmental Systems and Stewardship · Term 4

Evidence of Climate Change

Students analyze various lines of evidence for climate change, including temperature data, ice cores, and sea-level rise.

• Ontario Curriculum Expectations
• MS-ESS3-5

About This Topic

Students examine key evidence for climate change, including long-term temperature records from weather stations, ice cores that trap ancient atmospheres with rising CO2 levels, and satellite data showing sea-level rise from melting glaciers and thermal expansion. They plot trends on graphs, compare historical and current data, and link these patterns to increased greenhouse gases from human activities. This work builds data analysis skills while grounding abstract concepts in observable changes, such as Canada's shrinking Arctic ice.

In the Ontario curriculum's environmental systems unit, this topic develops critical thinking about evidence reliability and the role of scientific models. Students assess sources like NASA datasets versus unverified claims, learning criteria such as peer review and replication. Climate models, informed by past data, help predict scenarios like intensified storms, preparing students for stewardship discussions.

Active learning excels with this topic because students handle real datasets to create visualizations, simulate ice core extractions with layered sediments, and model sea-level impacts on coastlines. These methods transform passive reading into discovery, promote peer teaching during data debates, and make evidence memorable through tangible connections to local impacts.

Key Questions

1. Analyze different types of scientific evidence that support the reality of climate change.
2. Evaluate the reliability of various data sources used to study climate trends.
3. Explain how scientists use models to predict future climate scenarios.

Learning Objectives

• Analyze graphs of global average temperatures over the past century to identify trends.
• Compare data from ice cores, such as trapped gas concentrations and isotopic ratios, to infer past climate conditions.
• Evaluate the reliability of different data sources for climate change evidence, such as peer-reviewed scientific journals versus online forums.
• Explain how scientists use climate models to simulate past climate and predict future scenarios.
• Calculate the potential sea-level rise based on given data for glacial melt and thermal expansion.

Before You Start

Weather vs. Climate

Why: Students need to distinguish between short-term weather patterns and long-term climate trends to understand climate change evidence.

Data Analysis and Graphing

Why: Interpreting temperature records and sea-level rise requires students to be able to read and analyze line graphs and data tables.

Key Vocabulary

Greenhouse Gas	Gases in Earth's atmosphere that trap heat, such as carbon dioxide and methane. Increased concentrations contribute to global warming.
Ice Core	A long cylinder of ice drilled from glaciers or ice sheets. It contains trapped air bubbles and layers that provide information about past atmospheric composition and climate.
Sea-Level Rise	The increase in the average level of the world's oceans. It is caused by melting glaciers and ice sheets, and the thermal expansion of seawater as it warms.
Climate Model	A computer simulation that uses mathematical equations to represent the Earth's climate system. Models help scientists understand past climate and predict future changes.
Proxy Data	Indirect evidence of past climate conditions, such as tree rings, ice cores, and sediment layers, used when direct measurements are unavailable.

Watch Out for These Misconceptions

Common Misconception

Climate change is just natural weather cycles with no human role.

What to Teach Instead

Data like ice cores show unprecedented CO2 spikes matching industrialization timelines. Graphing activities help students overlay natural cycles with recent trends, revealing human fingerprints through peer comparisons and discussions.

Common Misconception

All climate data sources are equally trustworthy.

What to Teach Instead

Reliability varies by method, like calibrated satellites versus anecdotal reports. Source evaluation stations guide students to check peer review and error margins, building discernment through collaborative critiques.

Common Misconception

Climate models are unreliable guesses about the future.

What to Teach Instead

Models validate against historical data before projecting. Hands-on model-building with past evidence lets students test predictions, seeing how iterative refinements improve accuracy via group testing.

Active Learning Ideas

Gallery Walk: Climate Data Stations

Prepare stations with temperature graphs, ice core images, sea-level charts, and model predictions. Small groups visit each for 7 minutes, annotate evidence strength, then share findings in a class debrief. Extend by having groups defend one data type's reliability.

50 min·Small Groups

Ice Core Layering Simulation

Provide trays with colored salts and ice layers to mimic cores; students add 'CO2' markers by era. They excavate, record gas trends over time, and graph results. Discuss how cores provide proxy data for past climates.

35 min·Pairs

Sea-Level Rise Watershed Model

Build simple coastal models with sand, water, and rising 'ocean' levels using syringes. Groups measure inundation at different elevations, calculate impacts, and predict changes from data trends. Photograph before-and-after for reports.

40 min·Small Groups

Climate Model Debate Relay

Divide class into teams representing data sources; relay questions on predictions like temperature rise. Teams consult models, cite evidence, and vote on most reliable forecast. Conclude with consensus statement.

45 min·Whole Class

Real-World Connections

• Climate scientists at Environment and Climate Change Canada analyze satellite data and ground station readings to monitor changes in Arctic sea ice extent and thickness, informing policy decisions for northern communities.
• Oceanographers use tide gauge data and satellite altimetry to track global sea-level rise, providing critical information for coastal city planners in places like Halifax and Vancouver to prepare for increased flooding risks.
• Paleoclimatologists study ice cores from Antarctica and Greenland to reconstruct past atmospheric conditions, helping to understand the natural variability of Earth's climate system over thousands of years.

Assessment Ideas

Quick Check

Provide students with three short descriptions of climate evidence sources: a peer-reviewed journal article abstract, a blog post from an advocacy group, and a government scientific report summary. Ask students to rank them from most to least reliable and briefly explain their reasoning for one ranking.

Exit Ticket

On an index card, have students write one specific piece of evidence for climate change (e.g., rising global temperatures, melting glaciers). Then, ask them to write one sentence explaining how scientists collect or interpret this evidence.

Discussion Prompt

Pose the question: 'If a climate model predicts a significant temperature increase by 2100, what are two types of real-world data scientists might use to build confidence in that prediction?' Facilitate a brief class discussion, guiding students to connect models with observational data.

Frequently Asked Questions

What are the main lines of evidence for climate change in grade 6 science?

Key evidence includes rising temperature records from global stations, ice cores preserving CO2 levels from thousands of years ago, and sea-level rise data from satellites tracking glacier melt. Students analyze graphs to spot trends beyond natural variability, connecting to emissions. This fosters data literacy aligned with Ontario standards.

How do ice cores provide evidence of climate change?

Ice cores from Greenland and Antarctica contain trapped air bubbles showing CO2 and temperature correlations over 800,000 years. Recent layers reveal sharp rises unlike past cycles. Students simulate layering to grasp proxy data, making long timescales accessible and memorable.

How can active learning help students understand evidence of climate change?

Activities like graphing real datasets, simulating ice cores, and modeling sea-level rise let students manipulate evidence firsthand. Small-group stations encourage debating reliability, while whole-class relays build consensus. These approaches make complex data tangible, boost engagement, and develop skills in evidence evaluation over rote memorization.

How do teachers evaluate data source reliability for climate trends?

Teach criteria like peer review, data collection methods, and consistency across sources. Students compare NASA ice core data with blogs in gallery walks, noting biases. This practice, tied to Ontario inquiry expectations, equips them to discern science from misinformation in environmental discussions.