CLIMATE CHANGE Lesson Note
Learning Objectives
This SS3 Geography lesson note covers CLIMATE CHANGE for First Term, Week 5.
Lesson Note
Learning Objectives
By the end of the lesson, students should be able to:
1. Define climate change.
2. Identify the causes of climate change.
3. Explain the consequences of climate change.
4. Distinguish between natural and human causes of climate change.
5. Suggest ways of reducing climate change.
CONTENT
MEANING OF CLIMATE CHANGE
Climate change refers to long-term changes in the average weather conditions of a place or the Earth as a whole. These changes may involve temperature, rainfall, wind patterns, and the frequency of extreme weather events over many years.
Climate change can occur naturally, but human activities have become the main cause of the current global warming trend.
Global warming is the long-term increase in the Earth’s average temperature, while climate change includes global warming and other changes in climate patterns.
CAUSES OF CLIMATE CHANGE
The causes of climate change can be divided into two major groups: natural causes and human causes.
A. Natural Causes of Climate Change
1. Volcanic eruptions: Volcanoes release gases and particles into the atmosphere, which can temporarily affect the Earth’s temperature.
2. Changes in solar radiation: Variations in the energy received from the Sun can influence the Earth’s climate.
3. Changes in the Earth’s orbit: Changes in the Earth’s orbit and tilt affect how solar energy is distributed across the planet.
4. Ocean circulation: Changes in ocean currents can affect the distribution of heat around the Earth.
B. Human Causes of Climate Change
1. Burning of fossil fuels: The use of coal, petrol, diesel, and natural gas in industries, vehicles, and power stations releases carbon dioxide into the atmosphere.
2. Deforestation: Cutting down trees reduces the amount of carbon dioxide absorbed from the atmosphere.
3. Industrial activities: Factories release greenhouse gases that contribute to global warming.
4. Agricultural activities: Livestock farming and the use of certain fertilizers release greenhouse gases such as methane and nitrous oxide.
5. Bush burning: The burning of vegetation releases carbon dioxide and other gases into the atmosphere.
6. Improper waste disposal: Decomposing waste in landfills releases methane, a powerful greenhouse gas.
6. Urbanisation: Increased energy use, transportation, construction, and industrial activities in cities contribute to greenhouse gas emissions.
CONSEQUENCES OF CLIMATE CHANGE
Climate change has several effects on the environment and human activities.
1. Rise in temperature: Average global temperatures increase, causing hotter days and heatwaves.
2. Flooding: Heavy rainfall and rising sea levels can cause flooding in coastal areas and low-lying regions.
2. Flooding: Some areas experience prolonged periods of little or no rainfall, leading to water shortages.
4. Desertification: Increased heat and prolonged drought can contribute to the spread of desert-like conditions.
5. Food shortage: Changes in rainfall and temperature can reduce crop yields and affect livestock production.
6. Loss of biodiversity: Some plants and animals may lose their natural habitats or face extinction.
7. Rise in sea level: Melting land ice and the expansion of warming seawater cause sea levels to rise.
8. Health problems: Heat stress and changing environmental conditions can increase certain health risks.
CONTROL AND PREVENTION OF CLIMATE CHANGE
Climate change can be reduced through the following measures:
1. Planting trees and preventing unnecessary deforestation.
2. Using renewable energy sources such as solar and wind power.
3. Reducing the burning of fossil fuels.
4. Promoting public transportation, walking, and cycling where practical.
5. Improving waste management and recycling.
6. Adopting sustainable farming practices.
7. Enforcing environmental protection laws.
8. Educating the public about climate change and its effects.
Evaluation
OBJECTIVE QUESTIONS
Instruction: Choose the correct answer from options A–D.
1. What is climate change?
A. Daily changes in weather
B. Long-term changes in average weather conditions
C. Changes in the direction of the wind only
D. A sudden fall in temperature
2. Which of the following is a major human cause of climate change?
A. Rotation of the Earth
B. Burning of fossil fuels
C. Ocean tides
D. The phases of the Moon
3. Which gas is mainly released when coal and petrol are burned?
A. Oxygen
B. Nitrogen
C. Carbon dioxide
D. Hydrogen
4. Which of the following is a natural cause of climate change?
A. Deforestation
B. Industrialisation
C. Volcanic eruptions
D. Improper waste disposal
5. The long-term increase in the Earth’s average temperature is called ______.
A. Weathering
B. Global warming
C. Erosion
D. Condensation
6. One major consequence of climate change is ______.
A. A permanent end to rainfall
B. Rising sea levels
C. The disappearance of all winds
D. The stopping of ocean currents
7. Deforestation contributes to climate change because it ______.
A. Increases the number of trees
B. Reduces the absorption of carbon dioxide
C. Prevents all forms of flooding
D. Reduces all greenhouse gases
8. Which of the following is a renewable energy source?
A. Coal
B. Petrol
C. Diesel
D. Solar energy
9. Prolonged periods of little or no rainfall may result in ______.
A. Drought
B. Heavy snowfall everywhere
C. Increased soil fertility in all areas
D. Permanent flooding
10. Which of the following measures can help reduce climate change?
A. Continuous bush burning
B. Uncontrolled tree felling
C. Planting trees
D. Increasing the use of chemicals
EVALUATION 2 (THEORY)
1a. Define climate change.
1b. State five natural causes of climate change.
1c. Explain five human activities that contribute to climate change.
2a. Discuss five consequences of climate change on human beings and the environment.
2b. State five measures that can be adopted to control or reduce climate change.