---
title: "AP Environmental Science 9.10: Human Impacts on Biodiversity"
description: "Review AP Environmental Science 9.10, including HIPPCO, biodiversity loss, habitat fragmentation, invasive species, overexploitation, domestication, and mitigation strategies."
canonical: "https://fiveable.me/ap-enviro/unit-9/human-impacts-on-biodiversity/study-guide/xdoR1oUTdZfQLqRuehbD"
type: "study-guide"
subject: "AP Environmental Science"
unit: "Unit 9 – Global Change"
lastUpdated: "2026-06-11"
---

# AP Environmental Science 9.10: Human Impacts on Biodiversity

## Summary

Review AP Environmental Science 9.10, including HIPPCO, biodiversity loss, habitat fragmentation, invasive species, overexploitation, domestication, and mitigation strategies.

## Guide

Human activities lower biodiversity through six main pressures summarized by HIPPCO: [habitat destruction](/ap-enviro/key-terms/habitat-destruction "fv-autolink"), invasive species, population growth, pollution, climate change, and overexploitation. [Habitat fragmentation](/ap-enviro/key-terms/habitat-fragmentation "fv-autolink") breaks large habitats into smaller isolated patches, and the level of harm differs from species to species.

## Why This Matters for the AP Environmental Science Exam

[Unit 9](/ap-enviro/unit-9 "fv-autolink") carries a large share of the exam, and [biodiversity loss](/ap-enviro/key-terms/biodiversity-loss "fv-autolink") connects to almost everything in it: climate change, ocean acidification, invasive species, and endangered species. You should be able to explain how a specific human activity reduces biodiversity and then propose a realistic strategy that fixes the problem, not just name one. Free-response questions in this unit often reward you for explaining how a solution actually works and what its trade-offs or unintended consequences might be.

This topic also pulls in earlier units. Habitat fragmentation links back to [island biogeography](/ap-enviro/unit-2/island-biogeography/study-guide/bRMemtdNYzWXmblCACF9 "fv-autolink") and [population dynamics](/ap-enviro/unit-9/increases-greenhouse-gases/study-guide/xy8sIvBYMxVP54em0thk "fv-autolink"), while pollution and overexploitation connect to land use, agriculture, and fishing from Unit 5. Being able to move between cause, effect, and solution is exactly the kind of thinking this part of the course tests.

## Key Takeaways

- HIPPCO stands for Habitat destruction, Invasive species, Population growth, Pollution, Climate change, and Overexploitation, the main drivers of biodiversity loss.
- Habitat fragmentation splits large habitats into smaller, isolated areas, often from roads, pipelines, agriculture, development, and logging.
- The amount of fragmentation that harms a species varies from species to species within the same [ecosystem](/ap-enviro/unit-2/natural-disruptions-ecosystems/study-guide/QpHtIjQYZUMm1mTZghkU "fv-autolink").
- Climate change causes [habitat loss](/ap-enviro/key-terms/habitat-loss "fv-autolink") through changes in temperature, [precipitation](/ap-enviro/key-terms/precipitation "fv-autolink"), and sea level rise.
- Domesticating organisms for economic return, like honeybee colonies and livestock, can reduce that organism's biodiversity.
- [Mitigation](/ap-enviro/key-terms/mitigation "fv-autolink") strategies include [protected areas](/ap-enviro/key-terms/protected-areas "fv-autolink"), habitat corridors, sustainable land use, and habitat restoration.

## HIPPCO: The Main Drivers of Biodiversity Loss

Biodiversity is the variety of life on Earth, including different species, ecosystems, and the [genetic diversity](/ap-enviro/key-terms/genetic-diversity "fv-autolink") within a species. The factors that reduce it are easy to remember with the acronym HIPPCO.

### Habitat Destruction

Habitat destruction, fragmentation, or degradation makes it hard for species to survive. Common causes include urban development, agriculture, and logging.

Clearing tropical rainforest for crops or plantations is a frequent application of this idea. Rainforests hold a large share of Earth's species, so converting them to farmland or monoculture removes habitat that many species cannot live without. (This is an illustrative example, not required AP content.)

### Invasive Species

Invasive species live and sometimes thrive outside their normal habitat and threaten native species. They are often generalist, [r-selected species](/ap-enviro/unit-3/k-selected-r-selected-species/study-guide/Z3qZXHWAWrjSleoDvISp "fv-autolink"), so they can outcompete natives for resources.

As an example, the Burmese python in the Florida Everglades has no natural predators there and preys on native mammals, disrupting the food web. (Example, not required content.)

### Population Growth

A growing human population increases activities that harm [wildlife](/ap-enviro/unit-5/integrated-pest-management/study-guide/qT1rsJ89dPMIyQHRaWz4 "fv-autolink") and habitat, such as [urbanization](/ap-enviro/unit-5/impacts-urbanization/study-guide/uzvK2OeqgUJR8Ml2amhy "fv-autolink") and resource extraction. More people generally means more demand for land, water, and materials, which puts pressure on ecosystems.

### Pollution

Pollution harms species through toxic chemicals, plastic debris, and other contaminants that damage plant and animal health. Plastic in the ocean, for instance, can be mistaken for food and ingested or cause entanglement in marine animals. (Example, not required content.)

### Climate Change

Climate change shifts temperature, precipitation, and other [weather](/ap-enviro/unit-4/earths-geography-climate/study-guide/NA6ZNBygB1NgmyYP3xjV "fv-autolink") patterns, making survival harder for many species and altering migration and reproduction. It can cause habitat loss directly through changes in temperature, precipitation, and sea level rise. Melting [Arctic](/ap-enviro/unit-9/global-climate-change/study-guide/7uD60uqTmhzrFIlNVpw9 "fv-autolink") sea ice, which removes habitat for polar bears and walruses, is a common illustration. (Example, not required content.)

### Overexploitation

Overexploitation is the overuse of natural resources, including overharvesting wild animals and plants, which drives population declines and can lead to endangerment. The collapse of North Atlantic cod stocks from [overfishing](/ap-enviro/unit-5/impacts-overfishing/study-guide/3qhg3l72iRrDu0YemvRP "fv-autolink") is a well-known case. (Example, not required content.)

## Habitat Fragmentation

Habitat fragmentation happens when large habitats get broken into smaller, isolated areas. Causes include building roads and pipelines, clearing land for agriculture or development, and logging.

The key detail for the exam: the scale of fragmentation that hurts a species is not the same for every species. A small isolated patch may be fine for one organism but devastating for another that needs a large continuous range. So you cannot assume one threshold applies to a whole ecosystem.

## Domestication and Biodiversity

Some organisms have been partly or fully domesticated and are now managed for economic returns. Honeybee colonies and domestic livestock are the standard examples. Managing organisms this way can reduce the biodiversity of that organism, since human selection narrows genetic variety.

## Strategies to Reduce Biodiversity Loss

Humans can mitigate biodiversity loss in several ways:

- **Protected areas** set aside land or water where habitat and species are shielded from development and exploitation.
- **Habitat corridors** connect isolated habitat patches so species can move, find mates, and access resources, which helps counter fragmentation.
- **Sustainable land use practices** reduce damage from agriculture, logging, and development while still letting people use the land.
- **Habitat restoration** rebuilds lost or degraded habitat, such as replanting forests or restoring [wetlands](/ap-enviro/unit-8/human-impacts-on-wetlands-mangroves/study-guide/kxkfXkF2OACm1Tcwb8u7 "fv-autolink").

When you write about solutions, do not just name one. Explain how it works and consider its trade-offs. For example, a corridor only helps if it actually connects suitable habitat for the target species, and a protected area still needs enforcement to stop poaching or illegal logging.

## How to Use This on the AP Environmental Science Exam

### Free Response

When a question asks you to propose a strategy to protect biodiversity, name the strategy and then explain the mechanism. Saying "create a protected area" is not enough. Say what it protects, how it reduces a specific HIPPCO pressure, and what could go wrong. A strong answer also identifies a disadvantage or unintended consequence.

### MCQ

Expect questions that connect a human activity to a HIPPCO category, or that ask which strategy best addresses a described problem. Read carefully for the specific pressure being described, since habitat loss, pollution, and overexploitation can all appear in the same scenario.

### Common Trap

Watch for fragmentation questions that assume one patch size affects all species the same way. It does not. Match the strategy to the actual problem in the prompt instead of listing every conservation tool you know.

## Common Misconceptions

- **HIPPCO factors act alone.** In reality they overlap. Climate change, habitat loss, and pollution often hit the same population at once, which makes the total impact worse.
- **A small population automatically means an endangered species.** Small size alone does not equal endangerment. What matters is whether the species can [adapt](/ap-enviro/unit-2/adaptations/study-guide/NHy6ed9wummAeB8F0UDq "fv-autolink"), move, or recover from pressures.
- **Naming a solution is enough on the FRQ.** You need to explain how the strategy reduces a specific threat, not just list it.
- **Fragmentation harms every species equally.** The scale of fragmentation that causes harm varies from species to species within the same ecosystem.
- **Domestication boosts biodiversity.** Managing organisms like honeybees or livestock for economic return can actually narrow their genetic diversity.
- **Climate change only affects biodiversity through heat.** It also drives habitat loss through changes in precipitation and sea level rise, not just temperature.

## Related AP Environmental Science Guides

- [9.1 Stratospheric Ozone Depletion](/ap-enviro/unit-9/stratospheric-ozone-depletion/study-guide/HFK6z9TTzohtCQhNxeef)
- [9.3 The Greenhouse Effect](/ap-enviro/unit-9/greenhouse-effect/study-guide/lKgyKz5IQycpdIgNttSN)
- [Major Environmental Disasters](/ap-enviro/unit-9/major-environmental-disasters/study-guide/dIrhLcEPLwGrbvwuOu7z)
- [9.8 Invasive Species ](/ap-enviro/unit-9/invasive-species/study-guide/MnPc6GXboWzcwD2ABEFo)
- [Unit 9 Overview: Global Change](/ap-enviro/unit-9/review/study-guide/dGkREqWFNjVUtThq6HnM)
- [9.4 Increases in the Greenhouse Gases](/ap-enviro/unit-9/increases-greenhouse-gases/study-guide/xy8sIvBYMxVP54em0thk)

## Vocabulary

- **HIPPCO**: An acronym representing the six main factors causing biodiversity loss: Habitat destruction, Invasive species, Population growth, Pollution, Climate change, and Over-exploitation.
- **biodiversity**: The variety of all living organisms and species within an ecosystem, region, or the entire planet.
- **climate change**: Long-term shifts in global temperatures and weather patterns, accelerated by the release of greenhouse gases like carbon dioxide from deforestation.
- **domestication**: The process of breeding and managing organisms for human economic benefit, which can negatively impact the biodiversity of wild populations.
- **habitat corridors**: Strips of connected habitat that allow organisms to move between fragmented areas, maintaining genetic diversity and population connectivity.
- **habitat destruction**: The degradation or removal of natural environments where organisms live, often caused by human activities.
- **habitat fragmentation**: The breaking up of large, continuous habitats into smaller, isolated patches that reduces connectivity for organisms.
- **habitat restoration**: The process of rehabilitating degraded or lost habitats to restore their ecological function and support biodiversity.
- **invasive species**: Non-native organisms introduced to an ecosystem that outcompete native species for resources and can disrupt ecological balance.
- **over-exploitation**: The excessive harvesting or use of a species or resource beyond its ability to sustain itself.
- **pollution**: The introduction of harmful substances or contaminants into the environment that degrade ecosystems and harm organisms.
- **protected areas**: Designated regions where ecosystems and species are legally protected from development and exploitation to conserve biodiversity.
- **sea level rise**: An increase in ocean water height caused by thermal expansion of seawater and melting of ice sheets and glaciers.
- **sustainable land use practices**: Methods of using land that meet current human needs while preserving ecosystems and biodiversity for future generations.

## FAQs

### What is AP Environmental Science 9.10 about?

AP Environmental Science 9.10 explains how human activities reduce biodiversity and how people can mitigate biodiversity loss. The topic centers on HIPPCO, habitat fragmentation, climate-change habitat loss, domestication effects, protected areas, habitat corridors, sustainable land use, and habitat restoration.

### What does HIPPCO stand for in APES?

HIPPCO stands for habitat destruction, invasive species, population growth, pollution, climate change, and overexploitation. In AP Environmental Science, it is the main acronym for the human-driven factors that decrease biodiversity.

### How does habitat fragmentation reduce biodiversity?

Habitat fragmentation breaks large habitats into smaller isolated patches through roads, pipelines, agriculture, development, or logging. Smaller isolated patches can limit movement, mating, food access, and genetic diversity, but the amount of fragmentation that harms a species varies by species.

### How does climate change affect biodiversity?

Climate change affects biodiversity by changing temperature, precipitation, and sea level. Those changes can shift or remove habitat, disrupt migration and reproduction, and make some areas unsuitable for species that cannot adapt or move quickly enough.

### How can humans reduce biodiversity loss?

Humans can reduce biodiversity loss by creating protected areas, using habitat corridors, promoting sustainable land use practices, and restoring lost habitats. On the AP exam, explain how the strategy reduces a specific threat instead of only naming the strategy.

### How should I answer a biodiversity FRQ in AP Environmental Science?

Identify the human impact, connect it to a biodiversity effect, and explain a realistic mitigation strategy. Strong answers use a mechanism, such as how corridors reconnect isolated populations or how protected areas reduce habitat loss, and mention a limitation when the prompt asks for one.

## Structured Data

```json
{"@context":"https://schema.org","@type":"FAQPage","inLanguage":"en","mainEntity":[{"@type":"Question","@id":"https://fiveable.me/ap-enviro/unit-9/human-impacts-on-biodiversity/study-guide/xdoR1oUTdZfQLqRuehbD#what-is-ap-environmental-science-910-about","name":"What is AP Environmental Science 9.10 about?","acceptedAnswer":{"@type":"Answer","text":"AP Environmental Science 9.10 explains how human activities reduce biodiversity and how people can mitigate biodiversity loss. The topic centers on HIPPCO, habitat fragmentation, climate-change habitat loss, domestication effects, protected areas, habitat corridors, sustainable land use, and habitat restoration."}},{"@type":"Question","@id":"https://fiveable.me/ap-enviro/unit-9/human-impacts-on-biodiversity/study-guide/xdoR1oUTdZfQLqRuehbD#what-does-hippco-stand-for-in-apes","name":"What does HIPPCO stand for in APES?","acceptedAnswer":{"@type":"Answer","text":"HIPPCO stands for habitat destruction, invasive species, population growth, pollution, climate change, and overexploitation. In AP Environmental Science, it is the main acronym for the human-driven factors that decrease biodiversity."}},{"@type":"Question","@id":"https://fiveable.me/ap-enviro/unit-9/human-impacts-on-biodiversity/study-guide/xdoR1oUTdZfQLqRuehbD#how-does-habitat-fragmentation-reduce-biodiversity","name":"How does habitat fragmentation reduce biodiversity?","acceptedAnswer":{"@type":"Answer","text":"Habitat fragmentation breaks large habitats into smaller isolated patches through roads, pipelines, agriculture, development, or logging. Smaller isolated patches can limit movement, mating, food access, and genetic diversity, but the amount of fragmentation that harms a species varies by species."}},{"@type":"Question","@id":"https://fiveable.me/ap-enviro/unit-9/human-impacts-on-biodiversity/study-guide/xdoR1oUTdZfQLqRuehbD#how-does-climate-change-affect-biodiversity","name":"How does climate change affect biodiversity?","acceptedAnswer":{"@type":"Answer","text":"Climate change affects biodiversity by changing temperature, precipitation, and sea level. Those changes can shift or remove habitat, disrupt migration and reproduction, and make some areas unsuitable for species that cannot adapt or move quickly enough."}},{"@type":"Question","@id":"https://fiveable.me/ap-enviro/unit-9/human-impacts-on-biodiversity/study-guide/xdoR1oUTdZfQLqRuehbD#how-can-humans-reduce-biodiversity-loss","name":"How can humans reduce biodiversity loss?","acceptedAnswer":{"@type":"Answer","text":"Humans can reduce biodiversity loss by creating protected areas, using habitat corridors, promoting sustainable land use practices, and restoring lost habitats. On the AP exam, explain how the strategy reduces a specific threat instead of only naming the strategy."}},{"@type":"Question","@id":"https://fiveable.me/ap-enviro/unit-9/human-impacts-on-biodiversity/study-guide/xdoR1oUTdZfQLqRuehbD#how-should-i-answer-a-biodiversity-frq-in-ap-environmental-science","name":"How should I answer a biodiversity FRQ in AP Environmental Science?","acceptedAnswer":{"@type":"Answer","text":"Identify the human impact, connect it to a biodiversity effect, and explain a realistic mitigation strategy. Strong answers use a mechanism, such as how corridors reconnect isolated populations or how protected areas reduce habitat loss, and mention a limitation when the prompt asks for one."}}]}
```