Human Impact on the Environment

Human Impact on the Environment

Middle School

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Learning Objectives

• Identify human activities that change ecosystems and describe their effects.

• Explain what biodiversity is and why it is important for a healthy ecosystem.

• Compare renewable and nonrenewable resources and their effects on the environment.

• Analyze the pros and cons of different energy sources for our planet.

Key Vocabulary

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Anthropogenic Changes

Significant environmental changes that are directly caused by various human activities.

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Invasive Species

Non-native animals or plants that invade and negatively affect the habitats they enter.

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Overexploitation

When land is over-farmed or overgrazed, it removes essential nutrients from the soil.

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Climate Change

A significant, long-term change in the common weather patterns of a specific area.

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Biodiversity

The variety of different species of plants and animals found in a specific ecosystem.

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Speciation

The natural evolutionary process that results in the formation of an entirely new species.

Key Vocabulary

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Nonrenewable Resources

Natural resources, such as fossil fuels, that are used up faster than they can be replaced.

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Renewable Resources

Resources like wind, sun, or water that are naturally replenished over a short period of time.

Human Impact on Ecosystems

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Habitat Destruction

• ​Natural habitats are destroyed to create space for farms, roads, and houses.

• ​​This destruction causes the population of the native species to decrease significantly.

• ​Deforestation, or clearing forests, is a major form of habitat destruction.

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Pollution

• ​Harmful gases from cars and factories, like sulfur oxides, cause air pollution.

• ​​Water gets polluted by chemical runoff containing oil, fertilizers, and other waste.

• ​This pollution can harm or even kill off many local plant and animal species.

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Invasive Species

• ​These are non-native plants or animals that humans introduce into an ecosystem.

• ​​This can happen on purpose or sometimes completely by accident during transport.

• ​They harm native species by taking away their food, water, and space.

Multiple Choice

What are the three major ways human activities can negatively impact ecosystems?

• Habitat destruction, pollution, and the introduction of invasive species.

• Planting native trees and creating new wildlife preserves.

• Studying weather patterns and animal migration.

• Increasing the amount of food and water available for all animals.

Multiple Choice

How do invasive species harm the native species in an ecosystem?

• By taking away their food, water, and space.

• By cleaning up pollution from the air and water.

• By providing new food sources for native animals.

• By helping native plants grow by spreading their seeds.

Multiple Choice

If a large area of forest is cleared to build a new farm that uses chemical fertilizers, what is the most likely combined effect on the local ecosystem?

• The populations of native species would likely decrease due to a loss of their home and polluted runoff.

• The native species would quickly adapt to the new conditions and thrive.

• The new farm would provide more food for all the native animals, increasing their populations.

• The impact would be minimal as animals could simply move to a different forest.

Anthropogenic Changes

• Excessive farming or grazing strips the land of its resources, causing ecosystem collapse.

• Climate change is a long-term shift in weather patterns, linked to human activities.

• A rising human population places a greater strain on the planet's natural resources.

Multiple Choice

Which statement best defines climate change?

• A long-term shift in weather patterns linked to human activities.

• The day-to-day changes in temperature and precipitation.

• A natural cycle of the planet that is not affected by people.

• The seasonal variation in a region's climate.

Multiple Choice

What is the primary effect of a rising human population on the planet?

• It causes an immediate collapse of most ecosystems.

• It reduces the amount of land needed for farming.

• It increases the demand for the planet's natural resources.

• It leads to a decrease in global weather pattern shifts.

Multiple Choice

If a community continuously expands its farming and grazing into surrounding grasslands, what is the most likely long-term outcome for that environment?

• The local climate would immediately become warmer and drier.

• The land's resources would be stripped, potentially leading to ecosystem collapse.

• The number of native animal species would increase due to new food sources.

• The need for natural resources in the area would decrease over time.

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The Importance of Biodiversity

• Biodiversity is the variety of different species of organisms within a specific ecosystem.

• New species increase biodiversity, while the extinction of species decreases biodiversity.

• A diverse ecosystem is healthy and can better withstand diseases and other threats.

• Biodiversity provides beautiful landscapes for recreation, like in national parks and preserves.

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Multiple Choice

Which statement best defines biodiversity?

• The variety of different species of organisms within an ecosystem.

• The total number of individual animals in a single location.

• The different types of beautiful landscapes in national parks.

• The process by which new species are discovered by scientists.

Multiple Choice

What is the primary benefit of having high biodiversity in an ecosystem?

• A healthy ecosystem has more national parks for recreation.

• A healthy ecosystem can better resist diseases and other threats.

• A healthy ecosystem is one where no species ever go extinct.

• A healthy ecosystem is one with fewer species of organisms.

Multiple Choice

A forest fire causes the local extinction of several plant species. What is the most likely consequence for this ecosystem?

• The ecosystem's health would improve because there would be more resources for the remaining species.

• The ecosystem's health would decline because the loss of species makes it less able to withstand threats.

• The ecosystem would become more popular for recreation because it is less crowded.

• The ecosystem would not change, as the extinction of a few species has no effect on the overall system.

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Renewable vs. Nonrenewable Resources

Renewable Resources

• ​Nature replenishes these resources, like wind, sun, and water, so they will not run out.

• ​​Most renewable resources are better for the environment because they are not burned for energy.

• ​An exception is biofuels, such as ethanol from corn, which can create some pollution when burned.

Nonrenewable Resources

• ​These resources, like fossil fuels and coal, are limited and can be completely used up.

• ​​Extracting and burning them releases harmful chemicals that pollute the land, air, and water.

• ​Switching to renewables is costly as our current technology relies heavily on these fossil fuels.

Multiple Choice

What is the main difference between renewable and nonrenewable resources?

• Renewable resources are found in the ground, while nonrenewable resources are found in the atmosphere.

• Renewable resources can be replenished by nature, while nonrenewable resources are limited and can run out.

• Renewable resources create pollution, while nonrenewable resources are clean and safe for the environment.

• Renewable resources are expensive to use, while nonrenewable resources are free for everyone.

Multiple Choice

Based on their typical use, what is the most significant environmental advantage of using resources like wind and sun instead of resources like coal and fossil fuels?

• Wind and sun are easier to find and extract from the earth.

• Wind and sun are not burned for energy, which avoids releasing harmful pollution.

• Wind and sun are limited, which makes them more valuable.

• Wind and sun can be converted into biofuels like ethanol.

Multiple Choice

Given that most renewable resources are better for the environment, what is the most likely reason that nonrenewable fossil fuels are still widely used?

• Nonrenewable resources are actually easier to replenish than renewable ones.

• Burning nonrenewable resources has been shown to have no long-term effects on the planet.

• Our technology is heavily dependent on them, and it is expensive to switch to renewables.

• Biofuels, a type of nonrenewable resource, are the cleanest form of energy available.

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Common Misconceptions

Misconception	Correction
Introducing any new species to a habitat is good for biodiversity.	Invasive species can outcompete native ones and harm the ecosystem's health.
All renewable energy is 100% clean and pollution-free.	Some biofuels can still produce pollution when they are made and burned.
We only use fossil fuels because we lack other energy sources.	Renewable energy can be more expensive than established fossil fuel systems.

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Summary

• Human activities like pollution disrupt ecosystems and are worsened by overpopulation.

• Biodiversity, the variety of life, is crucial for a healthy ecosystem.

• Managing resources like water and electricity is essential for sustainability.

• Shifting to renewable energy is slow due to high costs and technology challenges.

Poll

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

• 1

• 2

• 3

• 4