Explain greenhouse energy pathways

Supplied materials

• All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
• Paper or a browser document for a labeled drawing, table or explanation.
• Worked problem inputs: An infrared-absorbing gas increases while incoming solar input is held fixed in a model. Explain the affected pathway.
• Assessment case 1: A model keeps incoming solar energy fixed while an infrared-absorbing gas increases. Which pathway is directly affected? Which inference or prediction is best supported?
• Assessment case 2: Which scientific label fits the specifically described step or feature? Supplied case: Earth emits thermal radiation.
• Assessment case 3: Which scientific label fits the specifically described step or feature? Supplied case: Greenhouse gas interacts with infrared.
• Assessment case 4: Which scientific label fits the specifically described step or feature? Supplied case: Warming alters another energy-balance factor.
• Assessment case 5: Which scientific label fits the specifically described step or feature? Supplied case: Thermal radiation leaves Earth’s surface.
• Assessment case 6: Warming reduces reflective ice and raises absorbed sunlight in the supplied loop. What follows? Which inference or prediction is best supported?

Learn the idea

Greenhouse gases interact with outgoing infrared radiation and affect Earth’s energy balance. They do not make sunlight stop entering. Climate change involves several interacting feedbacks and influences.

Incoming solar means energy arrives from the Sun. Outgoing infrared means Earth emits thermal radiation. Greenhouse interaction means gases absorb and emit infrared radiation. Feedback means change affects later climate response.

For the supplied mechanism problem, An infrared-absorbing gas increases while incoming solar input is held fixed in a model. Explain the affected pathway. The gas affects outgoing thermal-radiation interactions. It does not need to stop incoming sunlight to change the energy balance. The resulting temperature response depends on the complete model and feedbacks.

1. Read the supplied problem and mark the structures, processes or quantities named: An infrared-absorbing gas increases while incoming solar input is held fixed in a model. Explain the affected pathway.
2. Draw the relevant boundary, pathway or comparison and label it using the scientific ideas above.
3. Write a causal explanation or calculation, showing how each observation supports the result.
4. Compare your reasoning with the worked solution; name a condition that would change or limit the inference.

Check your reasoning

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Take it further

New model holds sunlight input fixed but changes infrared interactions. Expected: greenhouse effects can alter outgoing-energy pathways; sunlight need not be blocked for the balance to change.

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