Climate Change and Human Impacts

Climate Change and Human Impacts

High School

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Learning Objectives

• Define the greenhouse effect and identify the primary greenhouse gases.

• Explain how human activities like burning fossil fuels contribute to global warming.

• Analyze the primary sources of carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O).

• Describe the potential consequences of a warmer Earth on weather and biodiversity.

Key Vocabulary

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Global Warming

The gradual increase in Earth's surface temperature, linked to the buildup of greenhouse gases in the atmosphere.

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Greenhouse Effect

The process where atmospheric gases trap the sun's heat, which results in warming the planet's surface.

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Fossil Fuels

Carbon-based sources like coal, oil, and gas that release CO₂ when burned for energy.

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Deforestation

The large-scale and permanent removal of standing forests, which releases large amounts of carbon into the air.

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Urbanization

The physical growth of urban areas, which often leads to increased carbon emissions, pollution, and habitat loss.

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The Greenhouse Effect

• Earth’s atmosphere lets sunlight pass through to warm the planet's surface.

• ​Greenhouse gases in the atmosphere trap some of this outgoing heat energy.

• This natural process is essential for regulating Earth's temperature for life.

• Human activities increase these gases, trapping more heat and causing global warming.

Multiple Choice

According to the concept of the greenhouse effect, what is the direct result of an increased concentration of greenhouse gases in the atmosphere?

• More solar radiation is reflected before reaching the Earth.

• More heat escapes into space, cooling the planet.

• The temperature of the atmosphere drops significantly.

• Less heat escapes into space, warming the planet.

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Key Greenhouse Gases and Their Sources

• Carbon dioxide (CO₂) is released from burning fossil fuels in cars and power plants.

• Water vapor (H₂O) cycles quickly through evaporation as part of the water cycle.

• Methane (CH₄) comes from sources including livestock, landfills, and animal waste.

• Nitrous oxide (N₂O) is released from fertilizers, deforestation, and burning fossil fuels.

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Multiple Choice

Which of the following is identified as a primary source of Methane (CH₄) emissions?

• Power plants that burn coal

• The water cycle

• Evaporation from oceans

• Livestock production and animal waste

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Human Impact: Fossil Fuels & Transportation

Fossil Fuels and Energy

• Burning fossil fuels like coal and oil for energy is the main source of human-caused emissions.

• This process releases large amounts of carbon dioxide (CO₂) into the atmosphere, contributing to climate change.

• Power plants are a primary example, burning fuels to generate the electricity we use every day.

Transportation Emissions

• Road transport, a major user of petroleum, is the largest contributor to warming within the transportation sector.

• Vehicles release pollutants like carbon dioxide (CO₂) and nitrous oxides, which harm the environment.

• Switching to electric vehicles, trains, and bicycles can help reduce these harmful transportation emissions.

Multiple Choice

What does the slide identify as the primary source of human-generated emissions?

• The burning of fossil fuels for energy and transportation

• Industrial waste and mining

• Agricultural practices and livestock

• Deforestation and land clearing

Human Activity: Land Use & Deforestation

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Deforestation

• The permanent removal of forests is a major environmental issue.

• Logging and clear-cutting release stored carbon, contributing to global emissions.

• This also leads to soil erosion and can impair flood protection.

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Agriculture

• Fertilizer use is a primary source of nitrous oxide (N₂O).

• Livestock like cattle are major emitters of the greenhouse gas methane.

• Farming and road construction can also alter the Earth's surface reflectivity.

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Urbanization

• The expansion of cities leads to deforestation and widespread habitat destruction.

• Urban areas are significant sources of greenhouse gases and carbon emissions.

• Cities alter natural water flow by increasing the amount of surface runoff.

Multiple Choice

Which of these is a direct environmental consequence of deforestation mentioned on the slide?

• It contributes up to 20% of global carbon emissions.

• It increases the reflectivity of the Earth's surface.

• It is the main cause of industrial pollution.

• It is the primary source of methane emissions.

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Other Human Impacts

• Factories are a source of air pollution, releasing harmful fluorinated gases.

• ​Mining can release toxic heavy metals like lead and mercury into ecosystems.

• Human technology often increases environmental disorder, which is also known as entropy.

• Introducing non-native species permanently alters local biodiversity and the environment.

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Multiple Choice

What is described as a major environmental impact of mining and industrial processes?

• Alteration of the water cycle

• Release of toxic heavy metals and destruction of the lithosphere

• The primary emission of carbon dioxide

• Introduction of non-native species

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Consequences of a Warmer Earth

• A warmer atmosphere holds more water, fueling more powerful weather events.

• This can lead to severe floods, intense hurricanes, and heavy snow storms.

• Species must migrate to cooler areas when their environment becomes too hot.

• The loss of even one species can disrupt an entire ecosystem’s balance.

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Multiple Choice

What is a potential consequence of a warmer Earth on weather and species?

• Less water in the atmosphere and more stable ecosystems.

• Drier conditions globally and adaptation of all species.

• More intense weather events and species migration or extinction.

• Milder weather and an increase in all species populations.

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Common Misconceptions About Climate Change

Misconception	Correction
The greenhouse effect is entirely harmful.	The natural greenhouse effect is essential for life by keeping Earth warm.
Water vapor is the main cause of climate change.	CO2 is the primary driver of long-term warming due to its longer atmospheric life.
Individual actions don't impact global warming.	Activities like driving are a major part of road transport's contribution to warming.

Multiple Choice

How does the process of deforestation contribute to an increase in global temperatures?

• By increasing the amount of water vapor in the air.

• By releasing large amounts of stored carbon into the atmosphere.

• By emitting toxic heavy metals into the soil and water.

• By creating more land for urban development.

Multiple Choice

Explain why road transport is identified as a more significant contributor to global warming than other forms of transport mentioned in the text.

• It causes irreversible damage to the lithosphere through land scraping.

• It exclusively releases fluorinated gases into the atmosphere.

• It is the largest user of petroleum, emitting significant CO₂ and nitrous oxides.

• It is the only form of transport that causes urban sprawl.

Multiple Choice

A developing nation is clearing forests to make way for new farms to feed its population. Based on the text, predict and analyze the potential environmental trade-offs of this action.

• The main impact will be an increase in clean energy production from biomass.

• It will decrease greenhouse gases by replacing trees with crops that absorb CO₂.

• It may increase food security but also cause carbon emissions, soil erosion, and biodiversity loss.

• It will only lead to positive outcomes by providing more food and resources.

Multiple Choice

Propose a strategy for a city to reduce its overall contribution to climate change, using evidence from the text to justify two different approaches.

• Increase mining operations to boost the economy and encourage technological development.

• Promote a transition to electric vehicles and invest in hydroelectric power to reduce fossil fuel emissions.

• Expand landfills and sewage systems to manage waste more effectively.

• Focus solely on banning introduced species and building more road transport.

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Summary

• The human-enhanced greenhouse effect is the main cause of global warming.

• Burning fossil fuels is the largest source of human-generated emissions.

• Land use like deforestation and farming releases greenhouse gases.

• A warmer Earth leads to extreme weather and threatens species' survival.

• Industrial pollution and non-native species also harm the environment.

• Key greenhouse gases include CO₂, CH₄, and N₂O.

Poll

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

• 1

• 2

• 3

• 4