Unit 04 · Human Population & Resource Use
Human numbers and human appetite together set the load on the planet. This unit covers how populations move through the demographic transition as nations develop, how age-structure pyramids forecast future growth, why human population has climbed exponentially, and how the IPAT relationship ties impact to population, affluence, and technology. You’ll calculate an ecological footprint and separate renewable resources from the nonrenewable ones we’re drawing down. Mastery means you can read a population and its resource demand as one connected system.
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Demographic transition model | Thinks every country’s population behaves the same way. | Names the transition stages but cannot place a country in one. | Places a nation in a demographic-transition stage from its birth and death rates and predicts its next move. |
| Age structure & population growth | Cannot read a population pyramid. | Reads a pyramid’s shape but not its growth implication. | Uses an age-structure pyramid to forecast whether a population will grow, stabilize, or shrink, and explains exponential growth and doubling time. |
| The IPAT relationship | Blames environmental impact on population alone. | Names IPAT’s factors but cannot weigh them. | Uses I = P × A × T to explain how affluence and technology, not just population, drive environmental impact. |
| Ecological footprint & resources | Cannot distinguish renewable from nonrenewable resources. | Sorts resources but cannot connect use to a footprint. | Calculates an ecological footprint and explains resource depletion and the limits of renewable versus nonrenewable supply. |
| Field technique (footprint & population modeling) | Cannot set up a footprint or growth calculation. | Runs the numbers but mishandles units or assumptions. | Models population growth or footprint from real demographic data and defends the assumptions behind the estimate. |
| Integration (cross-domain) | Treats the science as isolated facts; makes no cross-domain connection. | Names a link to history, reading, or writing but cannot defend why it matters. | Connects the unit to its anchor across History · Reading · Writing (plus chosen electives) and defends why the connection matters. |
“The pyramid had a wide base, so this country will keep growing for decades even if birth rates fell today — that’s demographic momentum. But its footprint per person is small. A wealthy country with a narrow pyramid can still out-consume it, because IPAT is population times affluence times technology, not population alone.”
“More people means more pollution, so the biggest country is worst. The graph is a pyramid. I don’t really know what a footprint measures.”
You demonstrate this unit by modeling population growth from real demographic data and calculating an ecological footprint, defending your assumptions aloud — not a multiple-choice test. A criterion counts as mastered only when your model fits the data and you can justify what drives the impact. Mastery is demonstrated, not awarded.
A 5-page clipboard packet — unit overview, key terms, the mastery rubric, anchor examples, and a score sheet you can print and grade against.