Climate Systems and Climate Change

Climate Systems and Climate Change

Middle School

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Learning Objectives

• Define climate and understand how it is different from weather.

• Explain the natural and human-made causes of changes in our climate.

• Describe the greenhouse effect and its role in causing global warming.

• Identify the effects of climate change and how to help slow it down.

Key Vocabulary

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Climate

An area's long-term average weather, including temperature, precipitation, humidity, wind, and even the seasons.

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Ice Age

A historical period when Earth's temperatures are much cooler than normal, causing glaciers to spread widely.

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Greenhouse Effect

The process where certain gases in the atmosphere trap heat from the Earth, keeping it warm.

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Fossil Fuels

Carbon and hydrogen-rich fuels like coal, oil, and natural gas found in the Earth's crust.

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Deforestation

The large-scale clearing and removal of Earth's forests for other uses, impacting the climate.

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Earth's Climate?

Ice Age Climate

• ​During an ice age, Earth experiences very cold periods with cooler average temperatures.

• ​​Large ice caps cover the poles, and glaciers expand to cover more land.

• ​A small 5°C temperature drop can cause so much ice that sea levels fall.

Earth's Warm Climate

• ​Climate is the average weather in a place over a very long time.

• ​​This includes long-term patterns of temperature, rain, snow, humidity, and wind.

• ​For much of its history, Earth's climate was warmer and more humid than today.

Multiple Choice

According to the slide, what is the main difference between Earth's climate during an ice age compared to other times?

• Temperatures are cooler and glaciers expand.

• The climate is warmer and more humid.

• There is more volcanic activity.

• Sea levels are much higher.

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Natural Causes of Climate Change

Heating Up

• Sunspots are storms on the Sun that release extra energy, which in turn warms our planet.

• The slow movement of continents can change the flow of ocean currents and also trigger volcanoes.

• Volcanoes can release greenhouse gases into the air, which traps heat and warms the Earth.

Cooling & Wobbling

• When a large asteroid hits Earth, it can throw a lot of dust into the atmosphere.

• This dust can block sunlight from reaching the Earth's surface, causing the climate to cool down.

• Changes in Earth's orbit, wobble, and tilt affect how much energy it gets from the Sun.

Multiple Choice

Which of these natural events would most likely cause a cooling effect on the planet?

• A large asteroid impact

• An increase in sunspots

• Continents drifting apart

• Volcanoes releasing greenhouse gases

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Human-Made Climate Change

• Human-made climate change is happening much faster than natural climate shifts.

• The global temperature has risen by 1.4°F since the year 1880.

• The main cause is burning fossil fuels, which releases carbon dioxide (CO₂).

• These gases trap heat, warming the Earth, for thousands of years.

Multiple Choice

What is the primary human activity described as the cause of increased greenhouse gases?

• Natural climate cycles

• Experiencing more sunspots

• Deforestation on a massive scale

• Burning fossil fuels for energy

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Other Human Impacts on Climate

• Deforestation, clearing forests, reduces trees that absorb carbon dioxide (CO₂).

• Forests are important 'eco-sinks' that offset about 15% of CO₂ release.

• Desertification is the drying of land from farming and overgrazing.

• Building cities and dams can also impact local ecosystems and climate.

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Multiple Choice

How does deforestation contribute to climate change?

• It reduces the number of trees available to absorb carbon dioxide.

• It changes the natural flow of water in rivers.

• It concentrates energy use in small areas.

• It causes the land to become dry from overgrazing.

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Global Warming: Effects and Solutions

Harmful Effects

• It causes more extreme weather, such as powerful floods and dangerous hurricanes that can cause a lot of damage.

• As the Earth gets warmer, large ice caps at the poles melt, which causes the sea level to rise.

• The melting ice also destroys the homes of many animals, like polar bears, leading to significant habitat loss.

How We Can Help

• We can help by using energy-efficient appliances and light bulbs, and by using less electricity whenever possible.

• Choosing to carpool, use public transportation, or ride a bike helps reduce pollution from cars on the road.

• Using green energy like wind and solar power, and recycling materials, helps conserve Earth’s natural resources.

Multiple Choice

Based on the text, what is a direct consequence of melting ice caps?

• The expansion of animal habitats

• A rise in sea level

• A decrease in hurricanes

• An increase in fossil fuels

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Common Misconceptions

Misconception	Correction
The greenhouse effect is always bad.	The natural greenhouse effect is essential for life on Earth.
Earth's climate has always been stable.	The climate is dynamic and has changed many times.
A small temperature change doesn't matter.	A small change can have massive effects on the planet.

Multiple Choice

If a country decides to burn more coal for energy, how would this action impact the greenhouse effect?

• It would have no impact on the greenhouse effect.

• It would increase the amount of oxygen in the atmosphere.

• It would decrease the concentration of CO₂, weakening the greenhouse effect.

• It would increase the concentration of CO₂, strengthening the greenhouse effect.

Multiple Choice

What is the primary difference between climate change caused by plate movements versus change caused by deforestation?

• Plate movements are a natural process over millions of years, while deforestation is a rapid human activity.

• Plate movements are a human activity, while deforestation is a natural process.

• Plate movements release oxygen, while deforestation releases CO₂.

• Plate movements cause cooling, while deforestation causes warming.

Multiple Choice

A large area of forest is cleared for a new city (urbanization). Analyze the combined impact of this action on the climate system.

• It will only affect the local water cycle without impacting global climate.

• It will increase CO₂ absorption and decrease energy consumption, slowing warming.

• It will reduce CO₂ absorption and increase energy consumption, accelerating warming.

• It will cause an immediate ice age due to dust blocking the sun.

Multiple Choice

Greenhouse gases stay in the atmosphere for a long time. If we continue to use more fossil fuels, what is the most likely long-term result?

• Global temperatures will keep rising, and we will see more extreme weather for many years.

• The sea level will stop rising and then start to go down.

• The world's temperatures will suddenly get colder.

• Forests and oceans will absorb all the extra CO₂, solving the problem on their own.

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Summary

• Climate has always changed, but human activities are causing it to change faster.

• Burning fossil fuels releases excess CO₂, which traps heat and warms the Earth.

• Global warming causes rising sea levels, extreme weather, and loss of habitats.

• We can help by using clean energy, conserving resources, and protecting forests.

Poll

On a scale of 1-4, how confident are you about the concepts covered in today's review?

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• 3

• 4