AP Environmental Science · Unit 5 · Topic 5.7
How We Raise Our Food Matters
The hidden environmental cost of what's on your plate — exploring CAFOs, free-range grazing, overgrazing, and the planet's future.
EIN-2.H · EIN-2.I
Skill 5.E · Data Analysis
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Learning Objective EIN-2.H & EIN-2.I
Two Systems, Two Realities
Modern meat production exists on a spectrum. The two dominant approaches each carry distinct environmental, economic, and ethical trade-offs.
CAFOs / Feedlots
Concentrated Animal Feeding Operations
+Lower cost → affordable meat for consumers
+Requires less land per animal
+Animals reach market weight quickly
−Crowded conditions cause stress and disease
−Grain-fed diets are less natural for animals
−Large organic waste → contaminates ground & surface water
−Heavy antibiotic use → promotes resistance
Free-Range Grazing
Pasture-Based Animal Husbandry
+Grass-fed → natural diet throughout lifecycle
+Typically antibiotic & hormone-free
+Animal waste acts as natural fertilizer
−Requires large areas of land
−More expensive for consumers
−Risk of overgrazing → soil erosion and desertification
−Animals take longer to reach market weight
Essential Knowledge EIN-2.I.4–6
The Downstream Effects
Both production methods generate ripple effects across ecosystems. Here are the key environmental concepts you need to know for the AP Exam.
Overgrazing →
Desertification
When too many animals graze one area, vegetation is lost → topsoil erodes → low-precipitation areas degrade into desert.
CAFOs →
Water Pollution
Massive organic waste from feedlots can leach into groundwater and runoff into surface water, creating dead zones.
Livestock →
CH₄ & N₂O
Livestock are major sources of methane (enteric fermentation) and nitrous oxide (manure) — both potent greenhouse gases.
Less Meat →
Multiple Wins
Reduced meat consumption lowers CO₂, CH₄, and N₂O emissions; conserves water; reduces antibiotics; and improves topsoil quality.
Applied Skill 5.E · Data Analysis
You're the Farm Manager
A real-world scenario — analyze the situation and choose your approach. See the environmental consequences of your decision.
🌎 Scenario: Prairie Ranch, Kansas
500 acres · Beef cattle operation · Drought conditions increasing
You manage a 500-acre cattle ranch. The past two summers have been unusually dry. Your pastures are showing signs of stress — patches of bare soil are appearing near the water source, and stream clarity has declined. You must decide how to manage your herd of 200 cattle this season.
Key Terms — Click Cards to Reveal
Vocabulary to Know
AP Exam Practice · Skill 5.E
Test Your Knowledge
5 questions aligned to the APES learning objectives for Topic 5.7.
QUESTION 1 OF 5
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