Global warming is the long-term increase in Earth's average global temperature, driven primarily by human activities like fossil fuel combustion and deforestation that add CO2 to the atmosphere, leading to sea level rise, melting glaciers, and more frequent extreme weather.
Global warming is the long-term rise in Earth's average surface temperature. In APES, the cause-and-effect chain matters more than the headline. Humans burn fossil fuels, and that combustion is a chemical reaction between fuel and oxygen that yields carbon dioxide and water while releasing energy (EK ENG-3.E.1). That CO2 piles up in the atmosphere on top of natural sources like respiration, decomposition, and volcanic eruptions (Topic 7.4), and the extra greenhouse gas traps more heat.
The consequences are the part exams love to test. Warmer average temperatures mean melting glaciers and ice sheets, rising sea levels, and more frequent and intense extreme weather events. Think of global warming as the input and everything else (flooding coastal communities, shifting climates, stressed ecosystems) as the downstream output. Deforestation makes it worse from both directions, since it adds CO2 when trees are burned or decompose and removes a carbon sink at the same time.
Global warming sits at the intersection of three units. Topic 7.4 (Atmospheric CO2 and Particulates) covers where CO2 comes from, including natural sources under AP Enviro 7.4.A. Topic 6.5 (Fossil Fuels) explains the human source, since AP Enviro 6.5.A requires you to describe how burning fossil fuels generates electricity and AP Enviro 6.5.B covers the environmental costs. Topic 4.8 (Earth's Geography and Climate) gives you the baseline, because under AP Enviro 4.8.A you have to explain what controls climate naturally before you can argue what humans are changing. APES rewards mechanism over memorization, so being able to trace fuel to combustion to CO2 to trapped heat to sea level rise is exactly the kind of cause-and-effect reasoning the exam wants.
Keep studying AP Environmental Science Unit 4
Fossil Fuel Combustion (Unit 6)
This is the engine of global warming. Combustion of coal, oil, and natural gas yields CO2 and water while releasing energy (EK ENG-3.E.1), so every power plant burning fuel to spin a turbine is also adding greenhouse gas to the atmosphere.
Atmospheric CO2 and Particulates (Unit 7)
Topic 7.4 reminds you that CO2 also comes from natural sources like respiration, decomposition, and volcanoes. The exam expects you to separate that natural baseline from the human-caused surge. Volcanic particulates can even cool the planet briefly, but not enough to offset sustained human emissions.
Earth's Geography and Climate (Unit 4)
Climate isn't controlled by greenhouse gases alone. Mountains, ocean temperatures, and the sun's energy shape regional climate too (EK ENG-2.B.1). Knowing the natural controls lets you argue what's changing on top of them.
Climate Change (Unit 9)
Global warming is the temperature increase itself; climate change is the full package of effects that follow, like shifting precipitation patterns, ocean changes, and ecosystem disruption. Warming is the cause, climate change is the broader result.
Multiple-choice questions test the mechanism and the consequences. You might get a stem like a coastal community seeing more storm flooding than historical records show, where the answer is sea level rise from fossil fuel-driven warming. Other stems ask you to correctly describe the CO2-warming relationship or explain why short-term volcanic cooling can't cancel out sustained human emissions. On FRQs, global warming usually shows up as a link in a chain you have to build yourself, like connecting deforestation (as in the 2017 SAQ on Haiti) or growing food demand (2024 FRQ Q2) to carbon emissions and climate impacts. The move that earns points is naming the full pathway, not just saying 'it causes global warming.'
Global warming refers specifically to the rise in Earth's average temperature. Climate change is the bigger umbrella that includes warming plus everything it triggers, like altered precipitation, more extreme weather, and ocean changes. On the exam, use 'global warming' when you mean temperature and 'climate change' when you mean the whole system shifting. Saying global warming causes droughts skips a step; warming changes the climate, and the changed climate produces droughts.
Global warming is the long-term increase in Earth's average temperature, caused primarily by human activities like fossil fuel combustion and deforestation.
Fossil fuel combustion is a chemical reaction between fuel and oxygen that releases energy and yields CO2 and water, making it the main human source of greenhouse gas (EK ENG-3.E.1).
CO2 also enters the atmosphere naturally through respiration, decomposition, and volcanic eruptions, but human emissions are what drive the current warming trend.
Major consequences include rising sea levels, melting glaciers, and more frequent extreme weather events, and exam questions often ask you to link these back to fossil fuels.
Global warming is the temperature rise specifically; climate change is the broader set of environmental shifts that warming causes.
Strong FRQ answers trace the full chain: human activity, then CO2 release, then trapped heat, then a specific environmental impact.
It's the long-term increase in Earth's average global temperature, driven mainly by human activities like burning fossil fuels and deforestation. It connects Topics 6.5, 7.4, and 4.8 in the APES course.
Global warming is the temperature increase itself. Climate change is everything that follows from it, including shifting precipitation, extreme weather, and ocean changes. Warming is the cause; climate change is the broader effect.
No. CO2 occurs naturally from respiration, decomposition, and volcanic eruptions (AP Enviro 7.4.A). The problem is that fossil fuel combustion adds CO2 on top of that natural baseline faster than carbon sinks can absorb it.
No. Volcanic particulates can cause short-term cooling by blocking sunlight, but the effect fades within a few years while human CO2 emissions keep accumulating. Practice questions specifically test why this cooling is ineffective against sustained warming.
Warming melts glaciers and ice sheets and causes thermal expansion of seawater, which raises sea levels. Higher sea levels mean storm events flood coastal communities more often and more severely than historical records show, a setup that appears in exam-style questions.
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Review units, study guides, and course resources.
Check this vocabulary in multiple-choice context.
Apply key concepts in written AP responses.
Estimate the exam score you are working toward.
Review the highest-yield facts before practice.
Put the full course together before test day.