Climate Change, Causes and Consequences for SS 3

Class: Senior Secondary School 3 (SS3 / SSS 3)
Term: 1st Term
Week: 6
Age: 17 years
Duration: 45 minutes
Subject: Geography
Curriculum Theme: Geography
Previous Lesson: Denudational Processes, Chemical Weathering and Mass Movement
Topic: Climatic Change
Subject Matter: Meaning of climatic change, human causes of climate change, greenhouse effect, ozone layer depletion, chlorofluorocarbon gases, carbon emissions, deforestation, gas flaring, natural causes such as plate tectonics, solar output variation, changes in earth’s orbit, volcanism, ocean variability, consequences of climate change such as melting ice caps, heavy rainfall, increasing temperature, submergence of coastal cities

Specific Objectives

By the end of the lesson, students should be able to:

Cognitive Domain:

• Define climatic change.
• Identify human causes of climatic change.
• List natural causes of climatic change.
• State consequences of climatic change.

Affective Domain:

• Appreciate the importance of understanding and addressing climatic change.
• Participate actively in discussions about environmental protection.

Psychomotor Domain:

• Observe and identify examples of climatic change impacts from visual aids.
• Propose preventive measures against climatic change.

Social Domain:

• Share local examples of climate impacts during class discussions.
• Collaborate with peers in identifying solutions to climatic change.

Reference Materials

The following resources were used in planning this lesson:

• FCT-ERC SS 3 Scheme of Work, September 2014 curriculum.
• Relevant State Unified Scheme of Work.
• A suitable Geography textbook for SS 3.

Instructional Materials

The teacher will teach this lesson with the aid of:

• Documentary films
• Posters
• Photographs
• Models
• Government publications on environmental protection laws

Rationale for the Lesson

This lesson helps students understand the changes happening to the Earth’s climate and why these changes are occurring. It enables them to recognize how human and natural activities affect the environment and the potential impacts on their daily lives and future.

Prerequisite/Previous Knowledge

Students have basic knowledge of weather and climate elements, and some awareness of environmental issues.

Lesson Content/Board Summary

Climatic Change

Meaning of Climatic Change

Climatic change refers to a significant and lasting change in the statistical distribution of weather patterns over periods ranging from decades to millions of years. It can be a change in average weather conditions or in the distribution of events around that average (e.g., more or fewer extreme weather events).

Human Causes of Climatic Change

Human activities contribute significantly to climatic change by releasing greenhouse gases into the atmosphere. The following are human causes of climatic change:

1. Greenhouse Effect: This is the process by which radiation from a planet’s atmosphere warms the planet’s surface to a temperature above what it would be without its atmosphere. Gases like carbon dioxide, methane, and nitrous oxide trap heat, preventing it from escaping into space. Increased human activities lead to an enhanced greenhouse effect.
2. Ozone Layer Depletion: The ozone layer protects the Earth from harmful ultraviolet (UV) radiation. Depletion of this layer, mainly due to human-made chemicals, can lead to increased UV radiation reaching the Earth’s surface, affecting climate and health.
3. Chlorofluorocarbon (CFC) Gases: These are synthetic organic compounds that were widely used in refrigerants, aerosols, and solvents. When released into the atmosphere, CFCs rise to the stratosphere and destroy ozone molecules, contributing to ozone layer depletion and the greenhouse effect.
4. Carbon Emissions: The release of carbon dioxide (CO2) and other carbon compounds into the atmosphere, primarily from the burning of fossil fuels (coal, oil, natural gas) for energy, transportation, and industrial processes. This is a major contributor to the enhanced greenhouse effect.
5. Deforestation: The clearing of forests for agriculture, logging, or other land uses. Trees absorb CO2 from the atmosphere; their removal reduces the Earth’s capacity to remove CO2, leading to higher atmospheric concentrations.
6. Gas Flaring: The burning of natural gas associated with crude oil extraction. This practice releases large amounts of CO2 and other pollutants into the atmosphere, contributing to the greenhouse effect and air pollution.

Greenhouse Effect

The greenhouse effect is a natural process that warms the Earth’s surface. When the Sun’s energy reaches the Earth’s atmosphere, some of it is reflected back to space, and the rest is absorbed and re-radiated by greenhouse gases like carbon dioxide, methane, and water vapor. This trapped heat keeps the Earth warm enough to sustain life. However, increased concentrations of these gases due to human activities intensify this effect, leading to global warming.

Ozone Layer Depletion

The ozone layer is a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet (UV) radiation. Ozone layer depletion refers to the gradual thinning of the Earth’s ozone layer in the upper atmosphere caused by the release of chemical compounds containing gaseous bromine or chlorine from human activities. Chlorofluorocarbon (CFC) gases are a primary cause of ozone depletion.

Natural Causes of Climatic Change

Climatic change can also be influenced by natural processes. The following are natural causes of climatic change:

1. Plate Tectonics: The movement of Earth’s tectonic plates over millions of years can change the distribution of landmasses and ocean basins, affecting ocean currents and global atmospheric circulation patterns, which in turn influence climate.
2. Solar Output Variation: Changes in the amount of energy emitted by the sun, such as sunspots and solar flares, can lead to slight variations in Earth’s temperature.
3. Changes in Earth’s Orbit: Variations in Earth’s orbital path around the sun, its axial tilt, and its wobble (Milankovitch cycles) can alter the amount of solar radiation received by different parts of the Earth, influencing long-term climate cycles like ice ages.
4. Volcanism: Large volcanic eruptions can release significant amounts of ash and aerosols into the atmosphere. These particles can block sunlight, leading to short-term cooling, while volcanic gases can contribute to the greenhouse effect over longer periods.
5. Ocean Variability: Natural cycles within the ocean, such as El Niño-Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO), and Atlantic Multidecadal Oscillation (AMO), can influence global weather patterns and temperatures for several years or decades.

Consequences of Climate Change

The impacts of climatic change are widespread and severe. These include:

1. Melting Ice Caps and Glaciers: Rising temperatures cause polar ice caps and glaciers to melt, contributing to sea-level rise.
2. Rising Sea Levels: The expansion of warming ocean water and the melting of ice sheets lead to higher sea levels, threatening coastal areas.
3. Extreme Weather Events: Increased frequency and intensity of events such as heavy rainfall, droughts, heatwaves, and storms.
4. Increasing Temperatures: Global average temperatures are rising, leading to heat stress and altered ecosystems.
5. Submergence of Coastal Cities: Rising sea levels pose a significant threat to low-lying coastal cities and islands, potentially leading to their inundation.
6. Impact on Agriculture and Food Security: Changes in rainfall patterns and temperatures affect crop yields, leading to food shortages.
7. Disruption of Ecosystems: Many plant and animal species struggle to adapt to rapid climate shifts, leading to habitat loss and extinctions.

Quick Revision Table

Area	Key Point
Meaning of Climatic Change	Climatic change refers to a significant and lasting change in the statistical distribution of weather patterns over periods ranging from decades…
Human Causes of Climate Change	Human activities release greenhouse gases into the atmosphere, which trap heat and lead to global warming. These activities include: Burning of…
Greenhouse Effect	The greenhouse effect is a natural process that warms the Earth’s surface. When the Sun’s energy reaches the Earth’s atmosphere, some of it is…
Ozone Layer Depletion	The ozone layer is a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet (UV) radiation. Ozone layer depletion refers to the…
Natural Causes of Climate Change	Climate change can also be influenced by natural processes, although current changes are largely human-driven. Natural causes include: Plate…
Consequences of Climate Change	The impacts of climatic change are widespread and severe. These include: Melting Ice Caps and Glaciers: Rising temperatures cause polar ice caps…

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction and Recall

Time: 4 minutes

Teaching Skill: Set Induction

Teacher’s Activity: The teacher greets the students and asks them if they have noticed any changes in weather patterns recently, such as unusually hot days or heavy rains. The teacher then introduces the topic of Climatic Change.

Students’ Activity: Students respond to the teacher's questions and listen attentively to the introduction of the topic.

Learning Point: Prior climate change knowledge.

Step 2: Meaning of Climatic Change

Time: 5 minutes

Teaching Skill: Explanation/Discussion

Teacher’s Activity: The teacher explains the meaning of climatic change using simple terms and shows short clips or photographs illustrating observable changes over time (e.g., shrinking glaciers, dried-up rivers).

Students’ Activity: Students watch the clips/photographs, listen, and ask questions for clarification.

Learning Point: Meaning of climate change.

Step 3: Human Causes of Climatic Change

Time: 5 minutes

Teaching Skill: Explanation/Demonstration

Teacher’s Activity: The teacher discusses human activities that contribute to climatic change, such as the greenhouse effect, ozone layer depletion, CFCs, carbon emissions, deforestation, and gas flaring. The teacher uses diagrams or models to illustrate these concepts.

Students’ Activity: Students listen, take notes, and ask questions about the causes.

Learning Point: Causes of climate change.

Step 4: Natural Causes of Climatic Change

Time: 5 minutes

Teaching Skill: Lecture/Questioning

Teacher’s Activity: The teacher explains natural factors that can influence climatic change, including plate tectonics, solar output variation, changes in Earth’s orbit, volcanism, and ocean variability.

Students’ Activity: Students listen, contribute ideas, and ask questions.

Learning Point: Causes of climate change.

Step 5: Consequences of Climatic Change

Time: 5 minutes

Teaching Skill: Discussion/Visual Aids

Teacher’s Activity: The teacher leads a discussion on the consequences of climatic change, such as melting ice caps, heavy rainfall, increasing temperatures, and submergence of coastal cities. The teacher uses photographs or short documentary segments to show these impacts.

Students’ Activity: Students participate in the discussion, observe the visual aids, and mention local examples of these impacts.

Learning Point: Effects of climate change.

Step 6: Preventive Measures and Remedies

Time: 5 minutes

Teaching Skill: Brainstorming/Guidance

Teacher’s Activity: The teacher guides students to brainstorm and identify possible preventive measures and remedies for climatic change, encouraging sustainable practices.

Students’ Activity: Students suggest various ways to mitigate climatic change.

Learning Point: Preventive Measures Remedies.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

1. Define climatic change.
2. Mention three human causes of climatic change.
3. List two natural causes of climatic change.
4. State three consequences of climatic change.

Students’ Activity: Students answer orally and in writing, showing working or giving examples where the lesson requires it.

Learning Point: Climate change skills assessed.

Step 8: Note-Taking

Time: 8 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides students to copy the essential Board Summary on climate change into their notebooks, drawing attention to the key rules, examples, diagrams or distinctions already taught.

Students’ Activity: Students copy the essential notes carefully into their notebooks and correct any errors in their earlier work.

Learning Point: Climate change notes recorded.

Step 9: Conclusion

Time: 3 minutes

Teaching Skill: Reinforcement/Summarization

Teacher’s Activity: The teacher summarizes the key points of the lesson, emphasizing the importance of collective action to address climatic change, and assigns relevant homework.

Students’ Activity: Students listen to the summary and copy down the homework.

Learning Point: Climate change concepts consolidated.

Continuous Assessment/Further Study

Type: Homework / Map Work

Instruction: Complete the following tasks using the Board Summary, relevant maps or diagrams, and examples from the lesson.

1. Prepare a one-page revision note on Meaning of Climatic Change, using at least two examples from the Board Summary.
2. Draw a labelled diagram, sketch or outline map that illustrates Human Causes of Climatic Change where appropriate, and add a short explanation.
3. Construct a two-column table comparing key points from Human Causes of Climatic Change and Natural Causes of Climatic Change.
4. Use a Nigerian, African or world example within the lesson scope to explain Consequences of Climatic Change.
5. Write one examination-style paragraph explaining an important relationship or application in climate change.

Lesson Keywords

• Climatic Change – A significant and lasting change in global or regional climate patterns.
• Greenhouse Effect – The process by which certain gases in the Earth’s atmosphere trap heat, warming the planet.
• Ozone Layer Depletion – The thinning of the ozone layer in the Earth’s stratosphere, primarily due to human-made chemicals.
• Chlorofluorocarbon (CFC) – Synthetic organic compounds that deplete the ozone layer and contribute to the greenhouse effect.
• Carbon Emissions – The release of carbon compounds, especially carbon dioxide, into the atmosphere.
• Deforestation – The clearing of forests for other land uses.
• Gas Flaring – The burning of natural gas associated with crude oil extraction.
• Plate Tectonics – The theory that Earth’s outer shell is divided into several plates that glide over the mantle.
• Volcanism – The phenomenon of volcanic activity.
• Ocean Variability – Natural fluctuations in ocean conditions that can affect climate.

Differentiation

The teacher will provide additional support to struggling learners by using simplified explanations and more visual aids, while advanced learners will be encouraged to research and present on specific climate change impacts or solutions.

Suggested Lesson Videos

Search YouTube for Climate Change, Causes and Consequences Geography SS 3