Renewable energy
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Flip to reveal answersName five renewable energy sources.
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All 4 Flashcards — Renewable energy
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Question
Name five renewable energy sources.
Answer
Solar, wind, hydro and tidal, biomass and biofuel, and geothermal — each with a limit, which is why a real grid uses several.
Question
Why does circulating material cost energy?
Answer
Every loop involves collection, transport, sorting, cleaning, remanufacture and redistribution, none of which is free — and for a low-value material it can cost more than the material is worth.
Question
Why can a fossil-powered circular loop be worse than making new?
Answer
The same material is moved and processed many times. If each movement burns fuel, the total emissions can exceed those of a single new item.
Question
What is the one-line argument for renewables in a circular economy?
Answer
You cannot run a closed material loop on an open energy loop. If the energy is consumed and gone, the system is only half circular.
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Full study notes for Renewable energy
Topic 10.2 hub
Design for a circular economy
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