This unit closes the year. You will design a 2050 net-zero energy mix for a city and write a public-audience Op-Ed defending it. You will also write a Year-End Synthesis reflecting on all four course threads. The vocabulary below is the working language of energy systems and public-facing climate writing.
Vocabulary
| Term | What it means + visual cue | Sentence stem |
|---|---|---|
| Renewable | Energy from sources that naturally replenish: solar, wind, hydro, geothermal, biomass. Visual: Sun, wind turbine, dam, geothermal vent. | Renewable sources in my mix include ___. |
| Intermittency | Variation in output: solar at night = zero, wind on a calm day = zero. The main technical challenge for renewables. Visual: Up-down sawtooth graph of solar output over a day. | Intermittency in my mix is managed by ___. |
| Baseload | The minimum power demand a grid must always meet. Historically supplied by coal, gas, or nuclear. Visual: Flat-line graph at the bottom of a daily demand curve. | Baseload in my plan is supplied by ___. |
| Capacity factor | The fraction of nameplate capacity a power source actually delivers over time. Solar ~20-30%, nuclear ~90%, gas ~50%. Visual: Bar showing "rated" vs. "actual" for different sources. | The capacity factor of ___ in this region is about ___. |
| LCOE | Levelized Cost of Energy: total lifetime cost divided by total energy produced. Standard way to compare sources. Visual: Calculator with cost-per-kWh result. | LCOE for ___ is approximately $___ per MWh. |
| Grid | The network that transmits and distributes electricity from generators to users. Modernizing the grid is part of every transition. Visual: Web of power lines connecting plants and cities. | Grid upgrades needed for this plan include ___. |
| Transmission | Moving electricity over long distances at high voltage. Key bottleneck for connecting renewables to demand centers. Visual: High-voltage tower with long lines stretching to distant city. | Transmission constraints in this region mean ___. |
| Net-zero | When greenhouse gas emissions are balanced by removals: emit some, remove the equivalent. The 2050 target for most national plans. Visual: Balance scale with emissions on one side, removals on the other. | Net-zero for this city by 2050 requires ___. |
| Just transition | Shifting away from fossil fuels in a way that protects workers, communities, and equity. Without a just transition, decarbonization fails politically. Visual: Coal worker being trained in solar installation. | A just transition in this city means ___. |
| Energy mix | The combination of sources providing a region's energy. Mixes are designed, not natural. You can change yours. Visual: Pie chart with slices for each source. | My proposed 2050 energy mix is ___% solar, ___% wind, ___% ___. |
| Lifecycle | The full environmental impact of a technology from materials extraction → manufacturing → operation → disposal. Honest comparison requires lifecycle thinking. Visual: Circular arrow showing mining → manufacture → use → end-of-life. | On a lifecycle basis, this source ___. |
| EROI | Energy Return On Investment: energy you get out divided by energy you put in. Below 1, the source is a net consumer. Visual: Equation: Energy Out / Energy In. | EROI for ___ is approximately ___. |
| Decarbonization | Reducing the carbon intensity of an economy: replacing fossil fuels, electrifying transport, reducing material emissions. Visual: Downward arrow on a CO₂-per-GDP graph. | Decarbonization in this city must address ___. |
| Externality | A cost or benefit of a transaction borne by people not party to it. Fossil fuel pollution is a classic negative externality. Visual: Factory smokestack with smoke drifting over a neighborhood. | An externality of the current energy mix is ___. |
| Op-Ed | An opinion essay written for a public audience (usually 600-900 words). Argues a clear stance with evidence accessible to non-experts. Visual: Newspaper opinion page with byline. | My op-ed argues that ___ for the audience of ___. |
| Public audience | Readers who are not specialists. Requires plain language, vivid examples, and stakes that feel personal. Different from a policy brief or research paper. Visual: Crowd of diverse readers looking at a newspaper. | For a public audience, I will explain ___ by ___. |
| Synthesis | Bringing multiple ideas together into a coherent whole. The Year-End Synthesis asks you to weave together the 4 course threads. Visual: Multiple threads woven into a single rope. | My synthesis ties together ___, ___, and ___. |
Mix sketch. Pick one of the 8 U7 city options. Sketch a proposed 2050 energy mix as a pie chart with labeled percentages. Annotate at least 5 terms from this list explaining your choices.
With a partner: each of you reads aloud the first sentence of an Op-Ed you would write. Critique each other's hook: does it grab a public audience? Does it use precise vocabulary or vague language? Revise together.
Multilingual reference
For translations of these terms into Tamil, Hindi, French, Korean, or Japanese, see the Master Vocabulary Reference: U7 section. The five-column translation tables there are an AI-assisted starting reference: verify with a native-speaker peer or teacher when precision matters.
If you would like to discuss any of these terms in your first language with an AI tutor, you may. Document that use in the AI Documentation section of any assessment that follows. See the AI Documentation Protocol.