In a school lecture about Brazil’s energy transition, the teacher explains that solar and wind power are…

Questão

In a school lecture about Brazil’s energy transition, the teacher explains that solar and wind power are renewable because natural processes replace them continuously. These sources produce electricity with fewer greenhouse-gas emissions than coal and oil. However, their production can vary according to sunlight and wind, so Brazil needs energy storage and an integrated electricity grid to use them more reliably. The lecture concludes that expanding renewable energy can reduce environmental impacts, provided that planning also considers communities and land use. Based on the lecture, which option best summarizes the key points about renewable energy sources?

1. A) Renewable sources are naturally replenished and emit fewer greenhouse gases, but their variable production requires planning, storage, and grid integration.
2. B) Renewable sources depend mainly on coal and oil, while their changing production increases greenhouse-gas emissions.
3. C) Renewable sources provide stable electricity with fewer emissions, so communities and land use need not be considered in their expansion.
4. D) Renewable sources reduce greenhouse-gas emissions, but their environmental impacts make them unsuitable for Brazil’s energy transition.
5. E) Renewable sources are naturally replenished and produce electricity constantly, so they require no storage or grid planning.

✅ Resposta correta: alternativa A

Resolução passo a passo

1. Leio o texto e identifico os pontos centrais: solar e eólica são renováveis porque processos naturais as repõem continuamente; emitem menos gases de efeito estufa que carvão e petróleo; sua produção varia com sol e vento, exigindo armazenamento e rede integrada; e a expansão reduz impactos ambientais desde que o planejamento considere comunidades e uso da terra.
2. Comparo esses pontos com cada alternativa. A alternativa A reúne exatamente essas ideias: reposição natural, menos emissões e necessidade de planejamento, armazenamento e integração à rede para lidar com a variação da produção. Ela é a melhor síntese, e concordo com o gabarito oficial.
3. Por que as outras estão erradas: a B inverte a relação, pois as renováveis não dependem do carvão e do petróleo, e sim reduzem as emissões. A C contradiz o texto ao afirmar que a produção é estável e que comunidades e uso da terra não precisam ser considerados. A D distorce a conclusão, já que o texto defende a expansão das renováveis, com planejamento, e não sua inadequação ao Brasil. A E contradiz o próprio texto, que afirma que a produção varia e que armazenamento e planejamento de rede são necessários.

💡 Dica: Identifique os principais pontos discutidos na palestra.

Alternativa por alternativa

Raio-X da questão

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