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Brazilian Deforestation: Cycle A

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1). Reasons for deforestation are numerous and include immigration, subsistence farming, governmental policy, and cattle ranching.

2). Rainforests play a vital role in the carbon dioxide cycle in capturing CO2 from the atmosphere and converting it to plant material through photosynthesis.

3). Over half of all species currently living on Earth are believed to live in tropical rainforests â€" species diversity may be a key component to global stability.

4). Tropical rainforests play an important role in maintaining the composition and stability of the soil.

5). Deforestation disrupts the water cycle increasing runoff which in turn decreases infiltration, lowering ground water, and increasing the amount of material transported to water ways, altering the hydrosphere.

6). Positive foresting methods exist that lessen the impact on all spheres.

7). Deforestation affects global temperature change by altering the carbon cycle, water cycle, and oxygen cycle.


Scenario: Since 1970, 600,000 square kilometers of the Amazon rainforest have been lost through deforestation. Various causes have been cited, to include clearing for cattle grazing, colonization, agriculture, infrastructure expansion and logging.

Brazilians may resent other countries as they continue to pollute the atmosphere with fossil fuel emissions and engage in their own deforestation. But many look at rainforests as the lungs of the planet as the vegetation pulls carbon from the atmosphere. A look at the satellite image and animation to the right from Rondonia, Brazil shows large tracts of deforestation.

In answer to the question "how does climate change impact the Amazon?" Dr. Philip M. Fearnside of the National Institute for Research in the Amazon, discusses the hazard of continued deforestation:

"Deforestation is progressing rapidly, and if continued for 20 or 50 years the results would be disastrous. However, it is very important not to succumb to the fatalism that so often affects discussions of Amazonia. What happens depends on human decisions. This includes not only the direct deforestation that is destroying the forest, but also the climate changes that threaten to destroy the forest even without further clearing. Global warming is believed to be the cause of observed increases in the frequency of El Nino events, which are caused by warm surface water in the Pacific Ocean. Most climate models now predict "permanent" El Nino-like conditions to develop in the Pacific. One climate model (the Hadley Center model of the UK Meteorological Office) shows this permanent El Nino resulting in catastrophic die off of Amazonian forest by 2080 if global warming is unchecked. Other models currently do not show the connection between El Nino-like conditions and drought in Amazonia. Unfortunately for us, the fact that El Nino causes droughts in Amazonia is known from direct observations - it does not depend on the results of climate models. This is obvious to anyone in Amazonia who saw the fires in the El Nino of 1982-1983, 1997-1998 and 2003. The threat of a "permanent El Nino" is therefore to be taken very seriously. Again, it depends on how seriously society takes the problem to be. If fossil-fuel combustion and deforestation are reduced to reflect the importance of the problem, then the worst could be avoided. If this does not happen, the danger of a "runaway greenhouse" escaping from human control becomes much greater. Disintegration of the Amazon forest, with release of the carbon stocks in the biomass and soil, would be a significant factor in pushing us into a runaway greenhouse."*

*From October 22, 2006

Since 1975 Rondonia, Brazil has experienced a rapid growth in population due to immigration from surrounding states. Farmers have colonized the region adjacent to the main highway to take advantage of the cheap land offered by the government.

When we think of rainforests, the Amazon is probably the first region that comes to mind. But, the World Resources Institute reports that nearly one-third of the world's rainforests are in Africa, Asia, and other parts of Latin America beyond the Amazon. Even the United States has rainforests in Puerto Rico, Hawaii, Guam, American Samoa, and the U.S. Virgin Islands. Judging from the images above, rainforests in other parts of the world may be disappearing faster than in the Amazon region.

Global Rates of Rainforest Destruction
(Source: Deforestation Rates in Tropical Forests and Their Climatic Implications)

  • 2.47 acres (1 hectare) per second: equivalent to two U.S. football fields
  • 150 acres (60 hectares) per minute
  • 214,000 acres (86,000 hectares) per day: an area larger than New York City
  • 78 million acres (31 million hectares) per year: an area larger than Poland

These rates of tropical deforestation raise many questions. What happens to our planet when a rainforest disappears? What happens to air quality when the rainforests are gone? What happens to the soil when a rainforest disappears? What happens to surrounding water quality when a forest is burned to make way for farming and grazing? When the forest is gone, will it come back? People can move to cities, but where do the animals, birds, and insects go?

Doing research to find out about tropical deforestation can lead to learning about biology, agriculture, rainforests, population growth, endangered species, habitats, land use practices, global warming, weather, climate change, and air quality.


Author: Bob Myers, IGES
(703) 312-0823



Date: 7/30/2007


Scenario Images

Brazil Deforestation 1975-2001
Rondonia, Brazil Deforestation 1975-2001
Click here to watch animation
Data gathered over time by several in the Landsat series of spacecraft shows enormous tracts of forest disappearing in Rondonia, Brazil. This territory underwent an enormous rise in population towards the end of the twentieth century, buoyed by cheap land offered by the national government for agricultural use. Credit: NASA/Goddard Space Flight Center Scientific Visualization Studio.

Deforestation in Rondonia, Brazil 2000
Deforestation in Rondonia, Brazil 2000

This false color satellite image from 2000 shows the extent of deforestation in the state of Rondonia, Brazil. Tropical rainforest appears bright red, while pale red and brown areas represent cleared land. Black and gray areas have probably been recently burned. The Jiparaná River appears blue. Image courtesy NASA/GSFC/METI/ERSDAC/JAROS, and U.S./Japan ASTER Science Team.



  • Science
    National Science Education Standards - Science Content Standards The science content standards outline what students should know, understand, and be able to do in the natural sciences over the course of K-12 education.
      • Science as Inquiry (Std A)
        • Abilities necessary to do scientific inquiry
        • Understanding about scientific inquiry
      • Earth and Space Science (Std D)
        • Structure of the earth system
      • Science in Personal and Social Perspectives (Std F)
        • Populations, resources, and environments
        • Natural hazards
      • Science as Inquiry (Std A)
        • Abilities necessary to do scientific inquiry
        • Understanding about scientific inquiry
      • Earth and Space Science (Std D)
        • Energy in the earth system
        • Geochemical cycles
      • Science in Personal and Social Perspectives (Std F)
        • Natural resources
        • Environmental quality
        • Natural and human-induced hazards
        • Science and technology in local, national, and global challenges
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      Physical processes shape Earth’s surface and interact with plant and animal life to create, sustain, and modify ecosystems. The geographically informed person knows and understands:
      • The physical processes that shape the patterns of Earth’s surface
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Individual Assignment

Sphere Group Study

During this cycle you will become "experts" in the relationship of individual spheres. You will need to study the resources listed under readings, discuss your key ideas in your sphere group discussion space, and then submit your group's work for a grade.

Go to the course discussion space to find out which sphere you are studying during this module.

Read the scenario.


First, submit your individual questions and prior knowledge about this event and Earth system science to your sphere group discussion space. Then prepare a document about your prior knowledge and upload it to ESSEA.


  • Review the Individual Reflection Rubric.
  • Read the scenario.
  • Discuss your ideas about the effect of this event on your sphere in your sphere group discussion space.
  • Prepare and upload your prior knowledge reflection document to ESSEA.
  • Complete the individual reflection rubric.

Deadline: Friday, February 3 2017 11:59 PM (Eastern Time)
Upload Assignments
Team Assignment


  • Review the Group Sphere Study Rubric.
  • Describe your sphere in detail in the sphere group discussion space so you can share it with your Event Team next cycle. Refer to An Example of an ESS Analysis reading if you would like to review causal relationships.

Upload your group's most accurate analysis of the Sphere - Event interactions with reasoning and support to ESSEA and complete the rubric.
Deadline: Friday, February 10 2017 11:59 PM (Eastern Time)
Upload Assignments

Assessment is unavailable

Exploring The Environment: Loss of Habitat and Biodiversity (Cycle A)
In this problem-based learning (PBL) module, biodiversity, economic growth, and medical research vie for rainforest resources. Developed by NASA's Classroom of the Future at Wheeling Jesuit University. For grades 7-12.
Difficulty: intermediate

Earth Observatory: Tropical Deforestation (Cycle A)
This NASA article provides an overview of the issue of tropical deforestation, including: Introduction & Impacts of Deforestation, Climate Impacts, Causes of Deforestation, NASA Tropical Deforestation Research, and Sustaining Tropical Forests.

Encyclopedia of Earth - Deforestation in Amazonia (Cycle A)
This article discusses deforestation in the Amazon and includes: Introduction, History, Current rates and causes, Future paths, Impacts, Alternatives, and Further Reading.

Human Impact: Deforestation and Desertification (Cycle A)
By most estimates, the world's forests continue to disappear at an alarming rate. Logging, fires, and land-clearing for agriculture and grazing account for most of the loss. In some places, the green Earth is turning to desert.

World Resources Institute: Saving the Woods (Cycle A)
Search the World Resources Institute for current articles on deforestation.

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