How does Deforestation Contribute to Climate Change? — Reading Comprehension

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"This science passage is designed for middle school students, aligning with NGSS standards related to Earth's systems and human impact on the environment. It provides a comprehensive overview of how deforestation exacerbates climate change by disrupting the carbon and water cycles. Key concepts covered include photosynthesis, the greenhouse effect, and the role of forests as carbon sinks. The content is structured to support self-study, featuring a direct, factual tone and relatable examples. The passage aims to build a foundational understanding of this critical environmental issue, emphasizing the interconnectedness of ecological systems and the global climate. It also introduces solutions like reforestation as part of a broader discussion on environmental stewardship."

CONTENT PREVIEW

Deforestation, the large-scale clearing of forests for other land uses, is a significant contributor to global climate change. Forests are often referred to as the "lungs of the planet" because of their critical role in the carbon cycle. They absorb carbon dioxide (CO2) from the atmosphere through a process called photosynthesis, converting it into the energy they need to grow. This action helps to regulate Earth's climate by reducing the amount of greenhouse gases that trap heat in the atmosphere. When forests are destroyed, this natural process is disrupted, leading to an increase in atmospheric CO2 levels and a rise in global temperatures.

One of the primary ways deforestation contributes to climate change is by releasing stored carbon. Trees and other plants store vast amounts of carbon in their wood, leaves, and roots. When forests are cut down or burned, this stored carbon is released back into the atmosphere as CO2. Large-scale burning, a common method for clearing land for agriculture, is particularly harmful because it releases this carbon very quickly, along with other greenhouse gases like methane (CH4). This rapid release of stored carbon significantly intensifies the greenhouse effect, which is the process by which gases in Earth’s atmosphere trap heat, warming the planet.

Another critical effect of deforestation is the loss of a natural cooling system. Forests are an essential part of the water cycle; they release water vapor into the air through a process called transpiration. This water vapor forms clouds, which reflect sunlight and help to cool the planet's surface. Without forests, there is less cloud cover, leading to more sunlight reaching the ground and warmer local temperatures. This not only affects regional weather patterns but also contributes to the overall global temperature increase. Protecting existing forests and engaging in reforestation—the process of replanting trees—are crucial steps in mitigating climate change.

Fun Fact: A single mature tree can absorb approximately 48 pounds of carbon dioxide per year, which is equivalent to the amount of CO2 produced by driving a car 11,000 miles.

What is the primary process by which trees absorb carbon dioxide from the atmosphere?

RespirationDecompositionPhotosynthesisTranspiration

How do forests contribute to a natural cooling system?

They release oxygen, which cools the air.They trap heat, which prevents cold snaps.They release water vapor that forms clouds.They absorb solar energy, which cools the ground.

According to the passage, what is a major consequence of burning forests for land clearing?

It stops the carbon cycle.It releases stored carbon quickly.It causes an immediate decrease in rainfall.It increases local cloud cover.

Which of the following is an example of reforestation?

Clearing land for a new farm.Replanting trees in a previously logged area.Converting a forest into a city park.Cutting down old trees to plant new ones.

Which of the following best describes the main idea of the passage?

Deforestation is a problem in tropical regions.Trees are the only living things that use photosynthesis.Deforestation is a primary cause of climate change.Trees are important for the water cycle and weather.

What happens to the carbon stored in trees when they are cut down and burned?

It is absorbed by the soil.It is released back into the atmosphere.It is converted into oxygen.It becomes part of the soil's nutrients.

Based on the passage, what would be a likely effect of a large area of forest being replaced by a parking lot?

Increased cloud formation.A decrease in local air temperature.An increase in atmospheric CO2.A new natural cooling system.

The "greenhouse effect" is a process where:

Trees trap sunlight for photosynthesis.Gases in the atmosphere trap heat.Forests reflect sunlight back into space.Water vapor is released into the air.