Photosynthesis and freezer: what they have in common

1. Step 1. Photosynthesis — works like — Solar panel. Two ways of turning light into energy.
2. Step 2. Solar panel — is used in — Energy-efficient house. Solar energy.
3. Step 3. Energy-efficient house — uses — Thermal insulation. Insulation.
4. Step 4. Thermal insulation — is part of — Freezer. Polyurethane foam in the walls.

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