--- title: "Unit 9 – Global Change - AP Environmental Science" description: "Review Unit 9 – Global Change for AP Environmental Science with Fiveable study guides and practice resources." canonical: "https://fiveable.me/ap-enviro/unit-9" type: "unit" subject: "AP Environmental Science" unit: "Unit 9 – Global Change" --- # Unit 9 – Global Change - AP Environmental Science ## Overview Review Unit 9 – Global Change for AP Environmental Science with Fiveable study guides and practice resources. ## Study Guides - [9.5 Global Climate Change](/ap-enviro/unit-9/global-climate-change/study-guide/7uD60uqTmhzrFIlNVpw9) - [9.7 Ocean Acidification](/ap-enviro/unit-9/ocean-acidification/study-guide/F3GVfuEfIQERLREg0lk4) - [9.1 Stratospheric Ozone Depletion](/ap-enviro/unit-9/stratospheric-ozone-depletion/study-guide/HFK6z9TTzohtCQhNxeef) - [9.2 Reducing Ozone Depletion](/ap-enviro/unit-9/reducing-ozone-depletion/study-guide/XBG8o00CNUsGyCSOJK0c) - [Major Environmental Disasters](/ap-enviro/unit-9/major-environmental-disasters/study-guide/dIrhLcEPLwGrbvwuOu7z) - [9.6 Ocean Warming](/ap-enviro/unit-9/ocean-warming/study-guide/jkfHigqMY9PbkfE51027) - [9.8 Invasive Species ](/ap-enviro/unit-9/invasive-species/study-guide/MnPc6GXboWzcwD2ABEFo) - [9.3 The Greenhouse Effect](/ap-enviro/unit-9/greenhouse-effect/study-guide/lKgyKz5IQycpdIgNttSN) - [9.9 Endangered Species](/ap-enviro/unit-9/endangered-species/study-guide/nPHB7UlREP5mNGlxRUfD) - [9.10 Human Impacts on Biodiversity](/ap-enviro/unit-9/human-impacts-on-biodiversity/study-guide/xdoR1oUTdZfQLqRuehbD) - [9.4 Increases in the Greenhouse Gases](/ap-enviro/unit-9/increases-greenhouse-gases/study-guide/xy8sIvBYMxVP54em0thk) ## FAQs ### What topics are covered in APES Unit 9? APES Unit 9: Global Change covers 10 topics: Stratospheric Ozone Depletion, Reducing Ozone Depletion, The Greenhouse Effect, Increases in Greenhouse Gases, Global Climate Change, Ocean Warming, Ocean Acidification, Invasive Species, Endangered Species, and Human Impacts on Biodiversity. Together they connect human activity to large-scale environmental consequences. See the full topic breakdown at [/ap-enviro/unit-9](/ap-enviro/unit-9). ### How much of the APES exam is Unit 9? APES Unit 9 makes up 15-20% of the AP exam, making it one of the heavier-weighted units. It covers global climate change, the greenhouse effect, ozone depletion, ocean warming, ocean acidification, invasive species, and human impacts on biodiversity. Expect several multiple-choice questions and possible FRQ components drawn from these topics. ### What's on the APES Unit 9 progress check (MCQ and FRQ)? The APES Unit 9 progress check includes both MCQ and FRQ parts that pull from all 10 topics in the unit. The MCQ section tests concepts like the greenhouse effect, stratospheric ozone depletion, ocean acidification, and invasive species. The FRQ part typically asks you to explain causes and consequences of global climate change or human impacts on biodiversity, and may ask you to propose solutions. For matched practice questions that mirror the progress check format, visit [/ap-enviro/unit-9](/ap-enviro/unit-9). ### How do I practice APES Unit 9 FRQs? APES Unit 9 FRQs most often focus on global climate change, the greenhouse effect, biodiversity loss, and ocean acidification. These questions typically ask you to identify causes, describe environmental consequences, and propose realistic solutions or policies. To practice, write out full responses to past prompts, check that you use precise vocabulary like 'greenhouse gases' and 'stratospheric ozone', and time yourself at about 22 minutes per FRQ. Find Unit 9 FRQ practice at [/ap-enviro/unit-9](/ap-enviro/unit-9). ### Where can I find APES Unit 9 practice questions? The best place to find APES Unit 9 practice questions, including multiple-choice and practice test sets, is [/ap-enviro/unit-9](/ap-enviro/unit-9). That page has MCQ practice covering the greenhouse effect, ozone depletion, ocean warming, invasive species, and biodiversity. Working through unit-specific MCQs before a full practice test helps you spot which of the 10 topics still need attention. ### How should I study APES Unit 9? Start APES Unit 9 by building a cause-and-effect map that links human activities to outcomes like global climate change, biodiversity loss, and ocean acidification. Then study each of the 10 topics in order, since topics like The Greenhouse Effect (9.3) and Increases in Greenhouse Gases (9.4) directly set up Global Climate Change (9.5). Use diagrams for the greenhouse effect and ozone depletion cycles, make a comparison chart for invasive vs. endangered species, and practice explaining solutions out loud since FRQs reward clear, specific reasoning. Finish each study session with a short MCQ set to check retention. All topic guides and practice are at [/ap-enviro/unit-9](/ap-enviro/unit-9). ## Structured Data ```json {"@context":"https://schema.org","@type":"FAQPage","inLanguage":"en","mainEntity":[{"@type":"Question","@id":"https://fiveable.me/ap-enviro/unit-9#what-topics-are-covered-in-apes-unit-9","name":"What topics are covered in APES Unit 9?","acceptedAnswer":{"@type":"Answer","text":"APES Unit 9: Global Change covers 10 topics: Stratospheric Ozone Depletion, Reducing Ozone Depletion, The Greenhouse Effect, Increases in Greenhouse Gases, Global Climate Change, Ocean Warming, Ocean Acidification, Invasive Species, Endangered Species, and Human Impacts on Biodiversity. 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