---
title: "Global Climate Change — AP Bio Definition & Exam Guide"
description: "Global climate change is a meteorological disruption that shifts habitats and ecosystem distribution. Learn how it connects to selection, food webs, and disease on the AP Bio exam."
canonical: "https://fiveable.me/ap-bio/key-terms/global-climate-change"
type: "key-term"
subject: "AP Biology"
unit: "Unit 8"
---

# Global Climate Change — AP Bio Definition & Exam Guide

## Definition

In AP Bio, global climate change is a long-term meteorological shift in temperature and weather patterns that alters habitat and ecosystem distribution, listed in topic 8.7 as a driver of ecosystem disruption that can favor some adaptations, harm others, and reshape entire food webs.

## What It Is

Global climate change is the slow, large-scale shift in Earth's [temperature](/ap-bio/unit-3/enzyme-catalysis/study-guide/Jg1jljQ8ZHUvcaKprPGy "fv-autolink") and weather patterns over time. In the [AP Bio](/ap-bio "fv-autolink") CED it shows up under **EK 8.7.D.1** as one of the meteorological and geological events that change ecosystem structure and distribution, sitting right next to examples like El Niño, continental drift, and the meteor impact that wiped out the dinosaurs.

The key idea for AP Bio is that [climate change](/ap-bio/key-terms/climate-change "fv-autolink") moves the goalposts on the environment. When temperature and rainfall shift, the conditions that selection "favors" change too. A trait that was an advantage yesterday might be neutral or harmful tomorrow. Climate change doesn't create new mutations to solve the problem (mutations aren't directed by environmental pressure, per **EK 8.7.A.3**), it just changes which existing variations survive and reproduce. Species that can't shift their range, behavior, or genetics fast enough get squeezed out, and that's how a meteorological event becomes an extinction driver.

## Why It Matters

Global climate change lives in **[Unit 8](/ap-bio/unit-8 "fv-autolink"): Ecology**, specifically topic **8.7 Disruptions to Ecosystems**. It's the headline illustrative example for **AP Bio 8.7.D** (how geological and meteorological activity changes ecosystems) and it ties directly back to **AP Bio 8.7.A**, the interaction between the environment and preexisting variation in populations. That connection is the whole point: climate change is the [environmental pressure](/ap-bio/key-terms/environmental-pressure "fv-autolink"), and natural selection is the response. It also overlaps with **AP Bio 8.7.C** because human activity accelerates these changes at both local and global scales. On the exam, this term is your go-to example whenever a question asks how a non-biological force can reshape who survives in an ecosystem.

## Connections

### Adaptation and Natural Selection (Unit 8)

Climate change is the environment doing the 'selecting.' Under EK 8.7.A.1, an [adaptation](/ap-bio/unit-8/disruptions-ecosystems/study-guide/ra0njykAUxN9gf0swqKV "fv-autolink") is a variation favored by selection in a particular environment, so when the climate shifts, the set of favored traits shifts with it. The mutations don't appear on demand (EK 8.7.A.3); selection just sorts the variation already there.

### [Invasive Species (Unit 8)](/ap-bio/key-terms/invasive-species)

Warming temperatures open new niches and let species spread into ranges that used to be too cold for them. A climate shift can hand an [invasive species](/ap-bio/key-terms/invasive-species "fv-autolink") (like ones exploiting a predator-free new niche, EK 8.7.B.1) the exact opening it needs to outcompete natives.

### Human Impact on Ecosystems (Unit 8)

EK 8.7.C.1 says human activity accelerates change at local and global levels. Climate change is the global-scale version of that story, working alongside local pressures like [eutrophication](/ap-bio/key-terms/eutrophication "fv-autolink") and habitat conversion to push species toward extinction.

### Ecosystem Resilience and Food Webs (Unit 8)

Climate change rarely hits just one species. If a temperature shift knocks out a keystone species or breaks the timing between predators and prey, the disruption cascades through the whole food web and tests how resilient the ecosystem really is.

## On the AP Exam

Expect global climate change in multiple-choice stems that ask you to predict a downstream effect, like 'What is a consequence of global climate change on terrestrial ecosystems?' or 'Which factor is most likely to disrupt food webs due to global climate change?' These reward you for tracing one shift (temperature, rainfall, range) into a chain of ecological effects. You'll also see experimental-design stems, like the avian malaria question in Hawaiian birds, where you pick the data that best shows human-accelerated impact (think long-term trend data tied to temperature, not a single snapshot). No released FRQ has used this term verbatim, but it's exactly the kind of disruption a free-response question can use to test EK 8.7.D.1, so be ready to explain in writing how a meteorological change alters habitat, selection pressure, and species distribution.

## global climate change vs Continental drift

Both are listed in EK 8.7.D.1 as forces that reshape ecosystems, but they work on completely different timescales and mechanisms. Continental drift is a slow geological process that physically moves landmasses over millions of years (it's why an enzyme pathway can evolve independently on two continents that split 120 million years ago). Global climate change is a meteorological shift in temperature and weather that can play out over decades to centuries, often accelerated by humans.

## Key Takeaways

- Global climate change is a meteorological disruption under EK 8.7.D.1 that alters habitat and ecosystem distribution.
- It works by changing which preexisting variations selection favors, not by creating new adaptive mutations on demand.
- Human activity accelerates climate change at the global level, linking topic 8.7.D back to 8.7.C.
- A single climate shift can cascade through a food web, harm keystone species, and trigger extinctions.
- On the exam, use it to predict downstream ecological effects and to identify which data shows human-accelerated impact.

## FAQs

### What is global climate change in AP Biology?

It's the long-term shift in global temperature and weather patterns that changes habitat and ecosystem distribution. In the CED it appears under EK 8.7.D.1 as a meteorological event that disrupts ecosystem structure and dynamics.

### Does climate change cause new mutations that help species adapt?

No. Mutations are not directed by environmental pressure (EK 8.7.A.3). Climate change only changes which variations that already exist in a population are favored by selection.

### How is global climate change different from continental drift on the AP exam?

Both are EK 8.7.D.1 disruptions, but continental drift is a slow geological process that moves landmasses over millions of years, while climate change is a meteorological shift in temperature and weather that can be human-accelerated over far shorter timescales.

### How can climate change disrupt a food web?

A temperature or rainfall shift can wipe out or relocate a key species, throw off the timing between predators and prey, or let an invasive species move in. Removing one link, especially a keystone species, can cascade through the entire web.

### Is global climate change considered a human impact in AP Bio?

It's classified as a meteorological event under EK 8.7.D.1, but EK 8.7.C.1 makes clear that human activity accelerates these changes at local and global levels, so the two objectives overlap when humans drive the warming.

## Related Study Guides

- [8.7 Disruptions to Ecosystems](/ap-bio/unit-8/disruptions-ecosystems/study-guide/ra0njykAUxN9gf0swqKV)

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