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Illustration of three kids in a woodchip plant watching a conveyor belt move woodchips.
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A Chip Off the Old Block: Using Wood Energy to Heat Schools

  • Article
  • Middle School
  • Less than 30 minutes
  • Engineering and Forest Products
  • Wilderness
  • Applied Science
  • Biomass Heat Energy
  • Energy Efficiency
  • Forestry
  • Natural Gas Heating
  • Oil Heating
  • Thinning
  • Wood Chips
Illustration of three kids in a woodchip plant watching a conveyor belt move woodchips.
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One of the historic uses of wood was for heating. In recent years, however, most heating in the United States has come from other sources of energy, such as petroleum, gas, and electricity. The scientists in this study wondered if using wood for heating would save schools money compared to the way the schools are usually heated.

A Chip Off the Old Block: Using Wood Energy to Heat Schools

Meet the Scientists

Rick Bergman

Rick Bergman

My favorite science experience was working with two communities in southern Mexico. The communities were hoping to use more of their natural resources to become more self-sustaining as a community.... Read Full Bio
Tim Maker

Tim Maker

Wood Energy Scientist

I studied engineering and physics in college. My memorable experience was when a professor explained to all of us in his physics class about what he did as a scientist.... Read Full Bio

Thinking About Science

Research always has a purpose behind it. Is the research being done just to learn something new? Is its purpose to solve a problem? When scientists study a question to satisfy their curiosity about something, the research is called basic science. An example of basic science is when astronomers study the planet Mars. This kind of research is important, as it touches the mysteries of life. Often, basic science provides new information that can be used in the future to help solve problems. Most research being done today is done to solve problems. This kind of research is called applied science. Medical research is applied science, and most natural resource and environmental science is applied science. In the research you will read about in this article, the scientists hoped to solve a problem and help schools save money. Would you call this research basic or applied science.


Thinking About the Environment

You may have heard about the wildfires that sometimes burn in the Nation’s forests. In some cases, wildfires now burn hotter, longer, and over a wider area than wildfires of the past. This is because many forests today contain a lot of fuel. This fuel is often made up of many small-sized trees, which are growing because forest fires have not been allowed to burn there in the past. Before human development occurred in and near forests, wildfires could burn and, when they burned, they burned the small trees and other vegetation near the forest floor. Now that development occurs near and in the forests, we have not allowed wildfires to burn. The result is a lot of fuel in the form of small trees. One way to address this problem is to cut the small trees.

 

Cutting trees is expensive. To many people, it makes more sense to have a use for any tree that has been cut. To other people, leaving the small trees to decay in the forest also makes sense. This is because decaying tree returns nutrients to the forest soil. This article describes how schools used these trees to help them heat their buildings. In this research, the small trees were used in a wood heating system built just for the school. Do you think this is a good use for the small trees? Why or why not?

 


Introduction

As you read in “Thinking About the Environment,” forest managers were looking for a way to use small trees that were being cut from the forests. One of the historic uses of wood was for heating. In recent years, however, most heating in the United States has come from other sources of energy, such as petroleum, gas, and electricity. The scientists in this study wondered if using wood for heating would save schools money compared to the way the schools are usually heated. The school district in Darby, Montana, was interested in the same question (figures 1 and 2).

 

A map of the U.S. highlighting Darby Montana

Figure 1. Location of Darby, Montana.

Outside of Darby High School

Figure 2. Darby Junior High School.

Reflection Section

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Method

The scientists worked with partners to build the wood heating system. Such a system uses biomass heat energy. The new heating system included the following parts:

 

  1. Boiler house: A central building that houses the wood-burning boiler and a large wood storage bin (figure 3).
  2. Wood heating system: Includes the boiler, the storage bin, and automated belts to carry the wood from the storage bin to the boiler (figure 4).
  3. Heat distribution system: A series of underground pipes to carry the heat to the three schools. This system used existing pipes but improved them as needed.
  4. Improvements to existing heating equipment: Wherever possible, existing equipment was used for the new system. Also, the existing oil heating system was improved so it could be used as a backup to the new wood heating system.

 

The scientists kept careful records of all costs to build and operate the new heating system. They tracked operational costs for 2 school years.

 

 

Wood burning boiler

Figure 3. The Darby school’s wood-burning boiler.

wood chips on a conveyer belt with other equpiment

Figure 4. The Darby wood heating system. Note the wood is cut into wood chips and carried on a moving belt before it is stored in the storage bin.

Reflection Section

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Findings

The scientists compared the costs of the new biomass heating system with average historical costs of heating with oil and gas (table 1). Previously, oil had been used to heat the schools, and liquid propane (LP) gas was used to produce hot water. The new biomass heat system heated both the schools and the water, eliminating the need for LP gas.

 

A table of average historical uses vs the school year
Table 1. Comparison of historic costs for heating and the new biomass energy system. Note that in 2004–2005, historical usage costs included an estimate for the rising cost of oil

Reflection Section

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Discussion

By using biomass wood energy for heating, the Darby School District saved almost 50 percent of its fuel costs in 2003–2004, and almost 70 percent in 2004–2005. These costs do not include the cost of building the new biomass energy system and improving the old heating system. For a moment, let’s include those costs, which were a little less than $1,000,000. The scientists concluded that over a 20-year period of saving energy costs, the biomass heat energy system would pay for itself. This is largely due to the increasing costs of oil compared with the cost of wood chips.

 

It is costly to convert a conventional heating system into a biomass energy system, as was done in Darby. The scientists suggest the best time to install a biomass heating system is when new schools are being built. If new schools are close to a local source of wood chips, they should save a lot of money in energy costs.

 

 

Reflection Section

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Adapted from Bergman, R. and Maker, T. M. 2007. Fuels for schools: Case study in Darby, Montana, Forest Service General Technical Report FPL-GTR-173. Madison, WI: Forest Service, Forest Products Lab. 21 pp. http://www.fpl.fs.fed.us/documnts/fplgtr/fpl_gtr173.pdf.

The National Inquirer cover for the Bioenergy issue.

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Bioenergy - Vol. 9 No. 1

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  • The first page of the A Chip Off the Old Block FACTivity.
    In this FACTivity, you will consider the source and availability of different types of energy for heating your school. There is an extension to this activity that requires access to...

    FACTivity – A Chip Off the Old Block

    • Activity
    • Middle School
    • 1 Classroom Period
    • Wilderness
    • Class Discussion
    • Energy Source
    • Research Project
    In this FACTivity, you will consider the source and availability of different types of energy for heating your school. There is an extension to this activity that requires access to...
    • Explore Activity
    • Download FACTivity (PDF)
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    A Chip Off the Old Block: Using Wood Energy to Heat Schools

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  • Education Standards
  • Educator Guide
  • Lesson Plans
  • Education Files
  • Project Learning Tree

Standards addressed in this Article:

The Next Generation Science Standards (NGSS) are a set of K-12 science education standards emphasizing inquiry-based learning, real-world applications, and integrating engineering practices, aiming to deepen understanding of science while promoting critical thinking and problem-solving skills.
  • ESS3.C-M1
    Human activities have significantly altered the biosphere, sometimes damaging or destroying natural habitats and causing the extinction of other species. But changes to Earth’s environments can have different impacts (negative and positive) for different living things.
  • ESS3.C-M2
    Typically as human populations and per capita consumption of natural resources increase, so do the negative impacts on Earth unless the activities and technologies involved are engineered otherwise.
  • ESS3.D-M1
    Human activities, such as the release of greenhouse gases from burning fossil fuels, are major factors in the current rise in Earth’s mean surface temperature (global warming). Reducing the level of climate change and reducing human vulnerability to whatever climate changes do occur depend on the understanding of climate science, engineering capabilities, and other kinds of knowledge, such as understanding of human behavior, and on applying that knowledge wisely in decisions and activities.
  • ETS1.A-M1
    The more precisely a design task’s criteria and constraints can be defined, the more likely it is that the designed solution will be successful. Specification of constraints includes consideration of scientific principles and other relevant knowledge that is likely to limit possible solutions.
  • ETS1.B-M1
    A solution needs to be tested, and then modified on the basis of the test results, in order to improve it.
  • ETS1.B-M2
    There are systematic processes for evaluating solutions with respect to how well they meet criteria and constraints of a problem.
  • ETS1.B-M3
    Sometimes parts of different solutions can be combined to create a solution that is better than any of its predecessors.
  • ETS1.B-M4
    Models of all kinds are important for testing solutions.
  • ETS1.C-M1
    Although one design may not perform the best across all tests, identifying the characteristics of the design that performed the best in each test can provide useful information for the redesign process—that is, some of the characteristics may be incorporated into the new design.
  • ETS1.C-M2
    The iterative process of testing the most promising solutions and modifying what is proposed on the basis of the test results leads to greater refinement and ultimately to an optimal solution.
  • PS3.A-M3
    The term “heat” as used in everyday language refers both to thermal energy (the motion of atoms or molecules within a substance) and the transfer of that thermal energy from one object to another. In science, heat is used only for this second meaning; it refers to the energy transferred due to the temperature difference between two objects.
  • PS3.A-M4
    The temperature of a system is proportional to the average internal kinetic energy and potential energy per atom or molecule (whichever is the appropriate building block for the system’s material). The details of that relationship depend on the type of atom or molecule and the interactions among the atoms in the material. Temperature is not a direct measure of a system's total thermal energy. The total thermal energy (sometimes called the total internal energy) of a system depends jointly on the temperature, the total number of atoms in the system, and the state of the material.
The Common Core Standards are educational benchmarks in the United States that outline clear expectations for what students should know and be able to do in English language arts and mathematics from kindergarten through 12th grade, aiming to ensure consistency and coherence in education nationwide.
  • Cite specific textual evidence to support analysis of science and technical texts.
  • By the end of grade 8, read and comprehend science/technical texts in the grades 6-8 text complexity band independently and proficiently.
  • Determine the central ideas or conclusions of a text; provide an accurate summary of the text distinct from prior knowledge or opinions.
  • Follow precisely a multistep procedure when carrying out experiments, taking measurements, or performing technical tasks.
  • Determine the meaning of symbols, key terms, and other domain-specific words and phrases as they are used in a specific scientific or technical context relevant to grades 6-8 texts and topics.
  • Analyze the structure an author uses to organize a text, including how the major sections contribute to the whole and to an understanding of the topic.
  • Analyze the author's purpose in providing an explanation, describing a procedure, or discussing an experiment in a text.
  • Integrate quantitative or technical information expressed in words in a text with a version of that information expressed visually (e.g., in a flowchart, diagram, model, graph, or table).
  • Distinguish among facts, reasoned judgment based on research findings, and speculation in a text.
  • Compare and contrast the information gained from experiments, simulations, video, or multimedia sources with that gained from reading a text on the same topic.
Social Studies Standards are educational guidelines outlining the essential knowledge, skills, and concepts students should learn in subjects such as history, geography, civics, and economics, aiming to provide a comprehensive understanding of societal structures, historical events, and global perspectives.
  • People, Places, and Environments
  • Production, Distribution, and Consumption
  • Science, Technology, and Society
  • Time, Continuity, and Change

What Is a Natural Inquirer Journal?

Three Natural Inquirer journal covers with NI bee

 

A Natural Inquirer journal is a collection of 4-8 articles on a related science topic. Journals are written for a middle school audience, but they can also be adapted for both high school students and advanced upper elementary students. Some journals are particularly suited to high school students; you can find our grade level recommendations in the tags on the product page or by filtering journals by grade level.

Journals include:

  • Four to eight articles based on published, peer-reviewed research papers; the articles keep the research paper format (see more below) but are written in language students can understand.
  • A FACTivity for each article, which is an activity to complete after reading the article. The FACTivity helps reinforce major science concepts from the article. These activities are designed to be easy to implement, with few material requirements and options for adapting them for your audience or available resources. Some articles in a journal may have two FACTivities.
  • A short “Welcome to the journal” article about key background information and science concepts that unify the articles included in the journal
  • A glossary of new terms for each article and the introductory materials.
  • A list of related Natural Inquirer publications for each article as well as outside references.
  • Standards correlations, including Next Generation Science Standards, addressed in the articles and the FACTivities.

Journals may also include additional essays (called spotlights), other activities (like crossword puzzles or vocabulary challenges), and more.

 

A screenshot of the article resource tile for "A Flame Changer" showing the three different format option buttons.

Reading Modes

Journals are available in three different formats:

  • Hard copies can be ordered from the website and shipped, all free of charge.
  • PDF versions of the printed journal can be downloaded free on the website. The PDF version directly replicates the content and layout of the printed version. You can also download individual articles as pdfs.
  • The “Read Distraction Free” option allows the individual articles to open in their own window, without the rest of the website being visible. These articles can be found under the “Articles” tab. This version allows readers to scroll to particular sections of the article using the sidebar menu on the left side of the screen. This version also has interactive Reflection Sections and Number Crunches. Students can enter their answers, submit them, and then receive the correct answers to double-check their work. Submitted answers are not saved on the website and will disappear once the window is closed.

What's in a Natural Inquirer Article?

Here, we'll go into more detail about the parts of a Natural Inquirer article and give you some ideas about how they can be used.
  1. Meet the Scientists

    This section introduces the scientists (and others) who worked on the study. In their own words, they each share a memorable science experience, a favorite research project, or something they learned during the course of their education or research.

    Use this section to:

    • Introduce kids to the variety of people who work in science
    • Introduce kids to the variety of scientific fields and give brief descriptions of science-related jobs
    • Explore ways that people interact with science every day

    Next Generation Science Standards (NGSS) applications:

    • Science and Engineering Practices
    • Crosscutting Concepts: Influence of Science, Engineering, and Technology on Society and the Natural World

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    Many of the scientists and engineers featured in this section are also featured on our collector cards. Learn more about their work, how they got interested in their fields, and interesting projects they worked on. Cards can be printed as posters, too.

    A sample Meet the Scientists page, showing four different scientists
  2. Thinking About Science

    This section briefly describes a concept about science or scientific research. This overview can touch on topics like

    • study type (longitudinal study, quantitative vs. qualitative data),
    • behaviors of scientists (conducting literature reviews, collaborating with other specialists, replicating earlier studies),
    • the practice of science (the scientific method, engineering design, data collection, randomization, controls and variables),
    • or other aspects of science (bias, correlation vs. causation).

    Use this section to:

    • Reinforce steps in the scientific method and the process of science
    • Encourage students to think about the practice of science and what it can and cannot tell us
    • Consider the many types of scientific study and what information each type can provide

    Next Generation Science Standards applications:

    • Science and Engineering Practices
    • Life Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    You can use key words to search for other or related scientific topics on our website (e.g. “longitudinal study,” “bias,” or “sampling”).

    A sample Thinking About Science page from a recent monograph
  3. Thinking About the Environment

    This section provides a brief overview of a topic or concept in environmental/life science. The topic or concept is directly related to the research study that follows. Examples of topics include the carbon cycle, the water cycle, habitat fragmentation, phenology, biodiversity, and ecosystem services.

    Use this section to:

    • Provide important background information to help students understand the research study
    • Serve as a quick reference during reading or class instruction
    • Connect the research article with other activities or media on the same topic

    Next Generation Science Standards applications:

    • Life Science and some Earth Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    You can use key words to search for more resources on life or earth science topics on our website (e.g. “habitat,” “carbon,” or “genetics”).

    A sample "Thinking About the Environment" section from a recent monograph
  4. Introduction

    This section begins the scientific article format. Much like the published, peer-reviewed study this article is based on, the introduction provides background information for the study – what is currently known and what remains unknown. The introduction culminates in the question(s) the study hopes to answer.

    The introduction is also the first section with a Reflection Section. This section includes two or three questions to help kids reflect on what they’ve just learned in the Introduction. If they are using the online distraction-free reading mode, they can answer these questions directly on the website.

    Use this section to:

    • Review important background information that kids need to understand the study
    • Connect the study to the concepts addressed in the Thinking About Science and Thinking About the Environment sections
    • Understand research questions and hypotheses, including generating their own hypotheses given what they already know

    Next Generation Science Standards applications:

    • Life Science and some Earth Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    Use one of the guided reading lesson plans to help kids follow the format of a scientific paper.

    A sample introduction page from "Hidden in Plain Sight"
  5. Methods

    This section is the nuts and bolts of the study design – the who, what, when, where, why, and how of the research. Contained within the Methods section are usually maps of the study location or the set-up of study plots, as well as details about what data was collected and how.

    The Methods section also ends with a Reflection Section – two or three questions to help students think through what they just read. These questions are interactive on the distraction-free reading mode.

    Use this section to:

    • Show students how experiments and studies are designed and carried out
    • Explore sampling methods and randomization
    • Introduce various data collection tools (e.g. camera traps, surveys, insect collection tools, weather stations, etc.)
    • Explain bias and how studies are designed to remove bias
    • Help students gain experience with map reading

    Next Generation Science Standards applications:

    • Life Science and some Earth Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    Many Methods and Findings sections contain Number Crunches, which are simple math exercises designed to help students interact with the data from the study.

    A sample methods section of a monograph article showing a map
  6. Findings

    This section summarizes the data collected during the study. The Findings section usually includes data tables or graphs and highlights the significant data points from the study. This section often mentions statistical analysis or the use of computer programs to model or analyze the data, though these methods are only discussed generally.

    The Findings section also ends with a Reflection Section – two or three questions to help students think through what they just read. These questions are interactive on the distraction-free reading mode.

    Use this section to:

    • Have students practice reading and interpreting graphs and tables
    • Compare results between variables and controls
    • Explain the concept of statistical significance
    • Discuss how no data or negative results still provide valuable information

    Next Generation Science Standards applications:

    • Life Science and some Earth Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    Search the website for “map” or “graph” to find activities where students can practice making and reading maps and graphs.

    The beginning of a Findings section featuring a large data table
  7. Discussion

    This section concludes each article. In it, we summarize the main findings of the scientists’ study. Additionally, we present the scientists’ ideas about the limitations of their study, the big-picture impacts of their research, and the scientists’ plans for future study or action.

    The Discussion section ends with a Reflection Section – two or three questions to help students think through what they just read, especially general take-aways from the study. These questions are interactive on the distraction-free reading mode.

    Use this section to:

    • Discuss what conclusions can and cannot be drawn from the available data
    • Explain the difference between correlation and causation
    • Explore study limitations and opportunities for further study
    • Brainstorm ways the study findings could be applied to real-world situations

    Next Generation Science Standards applications:

    • Life Science and some Earth Science Disciplinary Core Ideas (depending on topic)
    • Most Crosscutting Concepts (depending on topic)

    Note that specific standards for this particular journal are linked on this educator guide tab.

    Other resources:

    Use the “Designing Your Own Study” resource page for videos of scientists discussing their own research studies. The page also includes educator resources to help students plan their own scientific studies.

    The beginning of the conclusion of "Hidden in Plain Sight"

Additional Resources on the Website

A screenshot of the product tabs for an NI monographOn the website, we pair each journal with a variety of other resources, as well. Use the tabs on the product page to browse through the following:

  • Related activities, including the FACTivity for each article
  • An “About” essay that gives some larger context for the research the scientists conducted or more information about the science topic from the journal
  • A glossary of all boldfaced terms from the journal
  • A “Scientists and Collaborators” page that lists the people involved in the studies in the journal; click on a researcher to reach their bio page and see what other articles they might be featured in
  • A “Related Content” page that lists both Natural Inquirer resources about similar topics and also outside reference materials

Article Selection and Review

Natural Inquirer partners with the USDA Forest Service, so we source research studies by Forest Service scientists that have been peer-reviewed and published in reputable journals. Some of our articles have also been created in collaboration with scientists from other Federal agencies, such as U.S. Geological Survey and the United Nations Food and Agriculture Organization, universities, and other non-profits.

All journal articles are reviewed by scientists who conducted the original research study to verify scientific accuracy. Journals are also reviewed by student editorial review boards of middle or high school students before publication. Additionally, all journals are reviewed by the Forest Service and the U.S. Department of Agriculture before publication.

A screenshot of the citation for "Lights, Camera, Tracks"Every journal article includes a citation of its source study. Many educators pair the original research paper with our article to help more advanced students learn how to read formal research papers. The journal article then serves as adapted primary literature, bridging the two articles.

Lessons

  • PDF preview for the Bioenergy lesson plan
    In this lesson plan, students learn about bioenergy, then stage a debate in a town considering switching from fossil fuels to biomass.

    Bioenergy Lesson Plan

    • Lesson Plan
    • Middle School
    • 2-3 Classroom Periods
    • Biomass
    • Class Discussion
    • Debate
    • Fossil Fuels
    • Group Project
    In this lesson plan, students learn about bioenergy, then stage a debate in a town considering switching from fossil fuels to biomass.
    • Explore Lesson Plan
    • Downloan Lesson Plan (PDF)
    • Explore Lesson Plan
    • Downloan Lesson Plan (PDF)

    Part Of

    A Chip Off the Old Block: Using Wood Energy to Heat Schools

  • PDF preview of the Questions Only lesson plan
    The goal of this lesson plan is to help students identify key concepts and develop their own interpretations of what they read. It includes 42 open-ended questions for them to...

    Lesson Plan – Questions Only

    • Lesson Plan
    • High School
    • Middle School
    • 2-3 Classroom Periods
    • Active Forest Management
    • Agriculture
    • Carbon
    • Citizen Science
    • Engineering and Forest Products
    • Fire
    • Insects
    • Pollinators
    • Pollution
    • Recreation
    • Social Science
    • Water
    • Wilderness
    • Wildlife
    • Class Discussion
    • Interpretation
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    The goal of this lesson plan is to help students identify key concepts and develop their own interpretations of what they read. It includes 42 open-ended questions for them to...
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    Part Of

    Bioenergy - Vol. 9 No. 1

  • PDF Preview of the Summary & Present Lesson Plan
    Students work in groups to analyze the Natural Inquirer article research study and give a brief presentation on their findings to their classmates. This lesson plan can be used with any Natural...

    Lesson Plan – Summarize and Present

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    • Active Forest Management
    • Agriculture
    • Carbon
    • Citizen Science
    • Engineering and Forest Products
    • Fire
    • Insects
    • Pollinators
    • Pollution
    • Recreation
    • Social Science
    • Water
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    • Class Discussion
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    Students work in groups to analyze the Natural Inquirer article research study and give a brief presentation on their findings to their classmates. This lesson plan can be used with any Natural...
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Education Files

Project Learning Tree

If you are a Project Learning Tree-trained educator, you may use “Our Changing World” and “Renewable or Not?” as additional resources.

Glossary

View All Glossary
  • average

    (av (ǝ) rij): A value that is computed by dividing the sum of a set of terms by the number of terms.

  • biomass

    (bī ō mas): The amount of living matter (in a unit area or volume of habitat).

  • conventional

    (kän ven chun ul): Ordinary.

  • natural resource

    (na ch(ǝ) rǝl rē sȯrs): A feature or phenomenon in nature that enhances the quality of human life.

  • operational

    (op ür a shun ul): Of or relating to performance of practical work or operations.

  • renewable natural resource

  • sustaining

    (suh stan ing): Keeping up or maintaining.

  • Photo of Dr. Rick Bergman. He is kneeling while wearing snow shoes in a fenced in backyard. The ground is covered in snow and he is kneelig next to a tireswing.

    Rick Bergman

    Chemical Engineer

    My favorite science experience was working with two communities in southern Mexico. The communities were hoping to use more of their natural resources to become more self-sustaining as a community....
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  • Photograph of Tim Maker holding two different types of wood chips on each hand.

    Tim Maker

    Wood Energy Scientist

    I studied engineering and physics in college. My memorable experience was when a professor explained to all of us in his physics class about what he did as a scientist....
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