Climate change is one of the hardest topics to teach in science — not because the concepts are too complex, but because students already have their own mistaken explanations before they enter the classroom. They know the term "greenhouse effect", but they understand it incorrectly. And the analogies we use to explain it — including the "greenhouse" analogy itself — often reinforce those very misconceptions.
Monroe et al. (2019), in their systematic review of climate change education strategies, found that effective programmes explicitly target and correct misconceptions, rather than simply adding new information on top of already-flawed mental models. This article shows how to do that with analogies that are more accurate, more memorable and more relevant to junior and senior high school students in Southeast Asia.
Misconceptions to Correct First
Before choosing an analogy, we first need to know what most students already believe about climate change. These misconceptions are not simply gaps in knowledge; they are active mental models. If they are not corrected, new information will be misinterpreted through an already-distorted lens.
The Problem with "Greenhouse" as an Analogy
Here's something rarely discussed in teaching guides: the "greenhouse effect" analogy itself has serious, documented scientific weaknesses. Research by Niebert & Gropengiesser (2013) shows that the greenhouse analogy leads students to conceptualise heat as a "material object" that gets trapped, like hot air inside glass walls.
The actual mechanism is different: the atmosphere traps infrared radiation through absorption and re-emission by gas molecules, not by physically blocking convection as glass walls do. As a result, students who "understand" the greenhouse effect through this analogy often hold incorrect models of how CO₂ reduction would work.
An analogy does not have to be scientifically perfect, but it must not mislead students about concepts they will study later on. Use analogies as a bridge, not as the end point of understanding.
Analogies That Work Better — and Why
Below is a comparison of several commonly used analogies, rated for scientific accuracy and for how easily junior and senior high school students can grasp them:
| Analogy | Strengths | Weaknesses | Rating |
|---|---|---|---|
| 🏠 Greenhouse | Familiar and widely known | Different mechanism: a greenhouse works by limiting convection, not through infrared radiation | Use with care |
| 🛏️ Earth's Blanket | More accurate: the gases hold in heat the way a blanket holds in body heat. Easy for students to picture | Does not explain the radiation mechanism in detail | Strong |
| 🚗 Parked Car | Very concrete and can be turned straight into an experiment | Same issue as the greenhouse: the mechanism is convection, not radiation | Use with care |
| 🌡️ Earth's Fever | Conveys an "unhealthy system"; good for building a sense of urgency | Does not explain the mechanism at all | For motivation |
| ⚖️ Carbon Balance | Highly accurate for explaining the balance between carbon emissions and carbon uptake | More abstract; needs a longer explanation | For Senior High |
Three Principles for Using Analogies Effectively in Class
A good analogy is not simply handed to students; it is used as an active thinking tool. Monroe et al. (2019) emphasise the importance of deliberative discussion, in which students do not just receive an analogy but also discuss where it fits and where it breaks down.
The most effective analogy is not the most scientifically precise one — it is the one that is hardest to misunderstand and easiest to stress-test with students. Use the blanket analogy as your foundation, clear up the confusion between the ozone hole and global warming early on, and always connect to local climate experiences your students feel first-hand.