Human Impacts

Which effect is not currently considered to be caused by global climate change?

• A. rising sea levels

• B. reduction in Arctic sea ice

• C. more severe tropical storms

• D. increased precipitation worldwide

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Which activity would reduce human sources of greenhouse gases?

• A. increasing the size of livestock herds

• B. monitoring worldwide volcanic activity

• C. using wind energy to generate electricity

• D. researching ways to add methane to the atmosphere

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Greenhouse gases are increasing in the atmosphere. As these gases increase, which of these processes occurs and allows more heat to be trapped?

• A. Ash particles in the air block sunlight.

• B. Solar radiation is reflected into space.

• C. Increased infrared radiation is absorbed.

• D. Decreased water vapor causes less cooling of the air.

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The graph shows the change in average global temperature during the last 100 years. The graph shows both natural and human contributions to climate change. Which of these statements is supported by the graph?

• A. Human activities have caused most of the change in Earth’s increased temperatures.

• B. Earth’s surface is becoming warmer mostly because of an increase in the sun’s energy.

• C. Natural factors have been the main factor in causing Earth’s climate to become warmer.

• D. Driving vehicles every day in crowded cities is the main contributor to increasing temperatures.

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Which of these is a consequence of deforestation?

• increased oxygen in the atmosphere

• decreased biodiversity and soil erosion

• decreased availability of sunlight and vitamin D

• increased annual precipitation and acid rain

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Which of the following best explains why urban areas have more air pollution than rural areas do?

• There are fewer green areas and more paved areas in urban areas.

• There are more cars and buses in urban areas.

• Drivers travel shorter distances between destinations in urban areas.

• Houses are closer together and larger.

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A new type of gasoline gives off excessive amounts of smoke. What should be studied before this type of fuel can be determined to be safe for the environment?

• the time it takes to produce the fuel

• the effect the smoke will have on the air quality

• the cost of producing the fuel

• if the fuel will be widely accepted by consumers

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A zoologist released a study that showed that the populations of some bird species have decreased in number by as much as 50% since 1966. The study found that food and water shortages were not the cause for the decrease in bird population. What other factor might have contributed to this decline?

• destruction of natural habitats

• overproduction of bird offspring

• an energy-rich diet

• fewer predators

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An urban sprawl is when natural and forest areas are developed with buildings and roads. How has urban sprawl affected farming?

• It increases the amount of available farmland needed for growing crops.

• It allows for areas of rainwater to collect that can be used to water crops.

• It has allowed for more nutrients to be available for crops.

• It decreases the amount of farmland that is available for growing crops.

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How can the use of fertilizers to improve lawns and gardens negatively impact the environment?

• it can be carried into local water supplies

• it can cause mutations in plants

• it can cause atmospheric pollution

• it cannot be absorbed by roots

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