Open with a jarring comparison: the average American uses about 77,000 kWh of primary energy per year; the average Ethiopian uses about 1,200 kWh — roughly 64× less. Ask: 'If I told you the United States uses about 26,000 TWh per year and China uses about 44,000 TWh per year, which country has the bigger energy problem?' Take 2–3 quick student responses without correcting. Then reveal per-capita: China ~31,000 kWh, USA ~77,000 kWh. The point: total consumption tells one story, per-capita tells another. Frame the lesson: today we quantify that gap and explain why it exists. This sets up SP 5 (data analysis) and SP 2 (map interpretation).

1. 7m

   Total vs. Per-Capita Consumption — and the World Map

   Content

   National energy demand can be reported two ways, and the two disagree. Total primary energy consumption is the raw quantity a country uses in a year (China ~44,000 TWh, USA ~26,000 TWh, India ~9,800 TWh). Per-capita energy consumption divides total by population and gives kWh per person per year (USA ~77,000; Germany ~40,000; China ~31,000; India ~6,900; Ethiopia ~1,200). Because China's population is ~1.41 billion versus the U.S. ~333 million, China's total is larger even though each American uses more than twice the energy of each Chinese resident. On a world map shaded by per-capita consumption, North America, Western Europe, Australia, and the Persian Gulf states glow dark; sub-Saharan Africa and much of South Asia are pale. Qatar is an outlier near 175,000 kWh/person because of a tiny population plus enormous gas-export infrastructure. The developed–developing divide is a per-capita phenomenon, not a total one.

   Delivery

   Emphasize the exact misconception to kill: 'big total = big lifestyle' is wrong. Ask students, 'Why does China rank #1 in total but middle-of-pack per-capita?' Expected answer: 1.4 billion people. Point out on the map that the same color band contains both Qatar and the U.S. despite very different economies — per-capita hides structure too. Preview that the scatter plot in the next beat unhides that structure by pairing per-capita energy with GDP. This beat targets SP 2 (visual representations) and SP 5.

2. 7m

   Units of Energy: kWh, J, BTU

   Content

   Three units dominate energy reporting and students must move between them fluently. The kilowatt-hour (kWh) is the unit on electric bills: 1 kWh is 1 kW × 1 hour = 3.6 × 10⁶ J = 3,412 BTU. The joule (J) is the SI unit used in scientific literature and IPCC reports (often as GJ or EJ). The British thermal unit (BTU) is dominant in U.S. natural-gas and HVAC markets; 1 BTU ≈ 1,055 J. Worked example: a household uses 900 kWh in a month. Convert to joules: 900 kWh × 3.6 × 10⁶ J/kWh = 3.24 × 10⁹ J = 3.24 GJ. Convert to BTU: 900 kWh × 3,412 BTU/kWh ≈ 3.07 × 10⁶ BTU. Notice the magnitudes: gigajoules for a household month, exajoules (10¹⁸ J) for whole countries per year. Global primary energy use in 2022 was ~600 EJ.

   Delivery

   Work the 900 kWh example on the board with units cancelling explicitly — students lose points on the AP FRQ for missing units. Ask: 'Why does the U.S. bill you in kWh but rate your furnace in BTU?' Answer: legacy of separate electric vs. thermal industries. Warn about the common error of writing 3.6 × 10⁶ as 3.6e6 or forgetting the exponent entirely. This beat targets SP 6 (mathematical routines).

3. 8m

   Drivers of Demand: Population, Industrialization, Standard of Living, and Energy Intensity

   Content

   Per-capita energy use rises with three things and falls with a fourth. It rises with (1) industrialization — factories, steel, cement, and freight are energy-hungry; (2) standard of living — cars, air conditioning, refrigerators, hot water, air travel, and electronics each add hundreds to thousands of kWh per person per year; and (3) climate/geography — cold winters or hot summers drive heating/cooling loads. It is moderated by (4) energy intensity, the energy used per dollar of GDP (MJ per $). Germany and Japan produce a dollar of GDP with far less energy than the U.S. or Russia because of efficient industry, dense cities, and public transit. This kills a common misconception: high consumption does NOT mean high efficiency. The U.S. uses more energy per capita AND more energy per dollar of GDP than Germany — it is both richer and less efficient. Meanwhile global demand keeps climbing (~1–2 %/yr) because industrializing economies (China, India, Indonesia, Vietnam, Nigeria) are moving hundreds of millions of people up the per-capita curve, more than offsetting flat/declining demand in OECD countries. The line graph of global consumption 1900 → 2022 shows this: coal-dominant early 1900s, oil surge post-WWII, gas rising from the 1970s, and total EJ still climbing today with no plateau.

   Delivery

   Ask, 'If Germany's per-capita is about half of the U.S., is Germany just poorer?' Force the class through the data — Germany's GDP per capita is $48k vs. U.S. $76k, but the energy gap (~40k vs. 77k kWh) is proportionally larger than the GDP gap. Germany is not just poorer; it is more efficient (lower energy intensity). This directly addresses the 'wealthy = efficient' misconception. Then ask, 'Has global energy consumption leveled off?' Expected answer: No — the line keeps climbing, driven by industrializing economies. Targets SP 1 and SP 5.

1. 30m

   AP Data Lab: GDP vs. Per-Capita Energy — Scatter Plot, Conversions, and Short FRQ

   Students work individually for the calculation and plotting sections (12 min), then in pairs to draft the FRQ paragraph (8 min), then whole-class debrief (10 min). Circulate during minutes 3–20 and check unit labels on every calculation. Targets SP 5 (Data Analysis), SP 6 (Mathematical Routines), SP 2 (Visual Representations), and SP 1 (Concept Explanation). Student handout — reproduce verbatim: AP Environmental Science — Global Energy Consumption Data Lab Part 1 — Data table (2022, approximate) - United States: population 333 M · total primary energy 26,000 TWh · GDP per capita $76,000 - Germany: population 84 M · total primary energy 3,400 TWh · GDP per capita $48,000 - Qatar: population 2.7 M · total primary energy 470 TWh · GDP per capita $88,000 - China: population 1,412 M · total primary energy 44,000 TWh · GDP per capita $12,700 - Brazil: population 215 M · total primary energy 3,300 TWh · GDP per capita $8,900 - India: population 1,417 M · total primary energy 9,800 TWh · GDP per capita $2,400 - Nigeria: population 219 M · total primary energy 1,600 TWh · GDP per capita $2,100 - Ethiopia: population 123 M · total primary energy 150 TWh · GDP per capita $1,000 Part 2 — Calculate per-capita energy consumption (kWh/person/yr) Use: per-capita (kWh/person/yr) = total (TWh) × 10⁹ ÷ population. - USA per-capita = ______ kWh/person/yr - Germany per-capita = ______ kWh/person/yr - Qatar per-capita = ______ kWh/person/yr - China per-capita = ______ kWh/person/yr - Brazil per-capita = ______ kWh/person/yr - India per-capita = ______ kWh/person/yr - Nigeria per-capita = ______ kWh/person/yr - Ethiopia per-capita = ______ kWh/person/yr Part 3 — Scatter plot On the grid (x-axis: GDP per capita, 0 to $100,000; y-axis: per-capita energy, 0 to 200,000 kWh/person/yr), plot all eight countries and label each point. Then: - Sketch a best-fit line through the main cluster (you may exclude Qatar — justify below). - Describe the correlation in one sentence. - Identify any outliers and give one reason for the outlier. Part 4 — Unit conversion (SP 6) A U.S. household uses 950 kWh of electricity in October. 1. Convert to joules. Show setup with units. Answer in scientific notation: ______ J 2. Convert to BTU: ______ BTU 3. If an Ethiopian household of the same size uses 40 kWh in October, the U.S. household uses how many times more energy? ______ × Part 5 — Short free response (SP 1, SP 7) In 4–6 sentences, respond: A student claims that because China's total energy consumption exceeds that of the United States, the average Chinese resident lives an equally energy-intensive lifestyle to the average American. Using at least three specific numeric values from Part 2, evaluate the student's claim. Then explain, using the concepts of industrialization, standard of living, and energy intensity, why per-capita energy use differs between developed and developing nations, and briefly propose one policy lever a developed nation could pull to reduce its per-capita demand without reducing standard of living.

   Materials

   • Printed handout (below) — one per student
   • Graph paper OR the pre-printed grid on the handout
   • Calculator
   • Pencil and ruler

   Example outputs

   • Part 2 sample answers: USA ≈ 78,100 kWh/person/yr; Germany ≈ 40,500; Qatar ≈ 174,100; China ≈ 31,200; Brazil ≈ 15,300; India ≈ 6,900; Nigeria ≈ 7,300; Ethiopia ≈ 1,220. Part 3: strong positive correlation between GDP per capita and per-capita energy; Qatar is an outlier — extremely high per-capita energy driven by gas-export infrastructure and a very small population, not by unusually high household consumption.
   • Part 4: (1) 950 kWh × 3.6 × 10⁶ J/kWh = 3.42 × 10⁹ J. (2) 950 kWh × 3,412 BTU/kWh ≈ 3.24 × 10⁶ BTU. (3) 950 ÷ 40 ≈ 23.75× more energy.
   • Part 5 exemplar: The claim is wrong. China's total (44,000 TWh) exceeds the U.S. total (26,000 TWh) only because China's population (1,412 M) is over 4× larger. Per-capita, the average American uses ~78,100 kWh/yr versus ~31,200 kWh/yr for the average Chinese resident — 2.5× more. Developed nations show higher per-capita use because industrialization built energy-hungry infrastructure (steel, freight, HVAC) and a higher standard of living adds vehicles, air conditioning, and appliances per household; energy intensity differences (the U.S. is less efficient per $ GDP than Germany) amplify the gap. A policy lever: aggressive building-envelope standards and heat-pump retrofits, which cut residential energy demand ~40% without reducing comfort.
   • presentation_text
   • Work through the handout in order: 1. Part 2 — calculate per-capita for all 8 countries 2. Part 3 — plot GDP vs. per-capita and describe the trend 3. Part 4 — convert 950 kWh into J and BTU (show units!) 5. Part 5 — write the 4–6 sentence FRQ paragraph with a partner

1. Country A has a total annual primary energy consumption of 12,000 TWh and a population of 1.2 billion. Country B has a total of 4,000 TWh and a population of 50 million. Calculate the per-capita energy consumption for each country in kWh/person/yr and identify which country more likely represents a developed nation. Show your work. (Targets SP 6 and SP 5.)

   calculationCountry A: 12,000 TWh × 10⁹ ÷ 1.2 × 10⁹ people = 10,000 kWh/person/yr. Country B: 4,000 TWh × 10⁹ ÷ 5.0 × 10⁷ people = 80,000 kWh/person/yr. Country B more likely represents a developed nation — despite a much smaller total, its per-capita use is 8× higher, consistent with high industrialization and standard of living.

2. A natural-gas furnace is rated at 60,000 BTU/hr. If it runs for 5 hours, approximately how many kWh of energy does it consume? A) 88 kWh B) 176 kWh C) 300 kWh D) 1,024 kWh (Targets SP 6.)

   multiple choiceA) 88 kWh. 60,000 BTU/hr × 5 hr = 300,000 BTU. 300,000 BTU ÷ 3,412 BTU/kWh ≈ 87.9 kWh.

3. Explain, in 2–3 sentences, why a country's total energy consumption can be misleading when comparing energy demand across nations. Use one specific numeric comparison from today's data. (Targets SP 1 and SP 5.)

   short answerTotal consumption reflects population size as much as lifestyle, so a populous country can have a large total while individuals use little energy. For example, China's total (~44,000 TWh) exceeds the U.S. total (~26,000 TWh), yet the per-capita U.S. figure (~77,000 kWh) is more than double China's (~31,000 kWh). Per-capita consumption is required to compare individual energy demand and standard of living.

4. A student argues that because the United States has higher per-capita energy consumption than Germany, the U.S. economy must be more energy-efficient. Evaluate this claim using the concept of energy intensity. (Targets SP 3 and SP 1.)

   short answerThe claim is incorrect. High per-capita consumption indicates that Americans use more energy per person, not that each unit of energy produces more economic output. Energy intensity (MJ per $ GDP) measures efficiency: the U.S. is roughly 5 MJ/$, while Germany is roughly 2.5 MJ/$, meaning Germany produces a dollar of GDP with about half the energy. So the U.S. is both higher-consuming AND less efficient than Germany — the opposite of the student's claim.

• ☐Printed data-lab handout (one per student) with the country table, calculation blanks, grid for scatter plot, conversion prompts, and FRQ prompt
• ☐Calculators (or student phones with calculator app)
• ☐Pencils, rulers
• ☐Projector for slide deck (map, line graph, scatter plot visuals)
• ☐Optional: colored pencils for shading developed vs. developing points on the scatter plot