Impacts of Human Activity on Ecosystems

What are the four categories of services that ecosystems provide?

• Support, provisioning, regulating, and cultural services

• Carbon, water, nitrogen, and phosphorous services

• Recycling, farming, filtering, and inspiring services

• Food, water, clothing, and fuel services

What is the monetary value of the services provided by ecosystems?

• $66 trillion/year

• $46 trillion/year

• $10 trillion/year

• $100 trillion/year

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Why is biodiversity important for ecosystems?

• It makes ecosystems more resilient to disturbances

• It reduces the impact of climate change

• It provides more raw materials for human use

• It increases the monetary value of ecosystem services

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What is one direct impact of deforestation on ecosystems?

• Spread of dry and unproductive landscapes

• Introduction of nonnative species

• Increased flooding and changes in water quality

• Decreased levels of polar sea ice

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What is the main driver of global warming?

• Introduction of invasive species

• Deforestation

• Overgrazing by cattle

• Burning of fossil fuels

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What is one impact of over-watering crops?

• Increased desertification

• Spread of dry and unproductive landscapes

• Decreased levels of polar sea ice

• Introduction of nonnative species

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What is one negative impact of invasive species on ecosystems?

• Decreased levels of polar sea ice

• Out-competition or predation of native species

• Spread of dry and unproductive landscapes

• Increased flooding and changes in water quality

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What is one direct impact of overharvesting certain organisms?

• Spread of dry and unproductive landscapes

• Increased flooding and changes in water quality

• Reduction in biodiversity and vulnerability to disturbances

• Decreased levels of polar sea ice

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What is one consequence of pollution on ecosystems?

• Spread of dry and unproductive landscapes

• Decreased levels of polar sea ice

• Introduction of nonnative species

• Increased flooding and changes in water quality

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What is the main focus of the next episode?

• The impacts of human activity on ecosystems

• The monetary value of ecosystem services

• The importance of biodiversity

• The causes and solutions to pollution

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