1. Introduce the data set.
Tell students that scientists with the Wildlife Conservation Society and Columbia University's Human Footprint Project mapped degrees of human influence over every square kilometer of Earth's surface (1 square kilometer = .39 square mile). Four factors were evaluated: population, travel routes, land use, and lights. While humans affect Earth in many ways, these four have the most immediate impact on wildlife and wild lands. Ask: Why do you think these four factors have the most immediate impact?
2. Display the Human Footprint data layer on the interactive map.
Display the interactive map with the Human Footprint layer selected. Click on the "i" symbol and review the legend. Explain that green signifies areas least impacted by humans. Purple signifies areas most impacted by humans. Ask: What is the predominant color in North America? What level of impact does it signify? Invite volunteers to point out any patterns they notice, such as greater human impact near urban areas.
3. Have students make a personal connection.
Ask students to find their hometown. Ask: What color is it on the map? How great is the human impact?
4. Discuss areas of lesser human impact.
Zoom back out to the global scale. Ask: What areas are less impacted by human activity? (Possible answers: the Amazon Rainforest, the Sahara Desert, Northern Canada, Northern Russia, and central Australia) What connections can you make between areas of less impact and geographic factors such as climate or physical landscape? Encourage students to notice that these areas tend to have a harsh climate and are remote or inaccessible due to physical features. For example, the Arctic Circle, the Sahara Desert, the Himalayas, and the Amazon rainforest are all remote and/or inaccessible. Ask: Will areas with lower degrees of human impact remain this way? Remind students that this map reflects four factors: population, travel routes, land use, and lights. Ask: Which factors are likely to change over time? (Each factor could increase, decrease, or remain unchanged over time.)
5. Discuss areas of greater human impact.
Ask: In which areas is the degree of human impact greater? (Possible answers: Europe, India, Southeast Asia, and the eastern coast of South America.) What connections can you make between areas of greater impact and geographic factors such as climate or physical landscape? Encourage students to notice that these areas tend to have a moderate climate, arable land, and proximity to oceans. They are also close to sources of fresh water and are easily accessible.
6. Have students compare the Human Footprint data layer and the Population Density data layer on the interactive map.
Click on the second map slide in the media carousel to load the interactive map with the Population Density layer selected. Explain to students that the Human Footprint data layer does not show population; it shows areas that have been affected by human populations. Have students compare the two data layers on the interactive map. Ask them to identify the differences they see.
Extending the Learning
Go to the National Geographic Society website to find out where you can get the Human Footprint DVD.
Subjects & Disciplines
- explain what information the Human Footprint data layer and map legend show
- use the Human Footprint data layer to analyze the degree of human impact in their hometown
- make connections between areas of human impact and geographic factors
- describe similarities and differences between the Human Footprint data layer and a Population Density data layer
- Visual instruction
National Standards, Principles, and Practices
National Geography Standards
- • Standard 14:
- How human actions modify the physical environment
What You’ll Need
The resources are also available at the top of the page.
Background & Vocabulary
“Human footprint” is a phrase used to describe the environmental impact humans have had on the Earth’s surface.
Recommended Prior Activities
The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit. The Rights Holder for media is the person or group credited.
Christina Riska, National Geographic Society
Patricia Norris, National Geographic Society
Amy Grossman, National Geographic Society
Mary Crooks, National Geographic Society
Jennell Ives, Wildlife Conservation Society
National Geographic Program
Special thanks to Adventure Ecology, Algalita Marine Research Foundation, Forest Stewardship Council, and Transgroup Worldwide Logistics.
adapted from National Geographic “Human Footprint Educational Resource”
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