Question

Why is a considerable amount of energy is required

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Answer 1

Answer:

High quality example sentences with “a considerable amount of energy” in ... must be extracted, a process that can itself require a considerable amount of energy

Answer 2

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In addition, a ground-breaking study by the US Department of Energy's National Renewable Energy Laboratory (NREL) explored the feasibility of generating 80 percent of the country’s electricity from renewable sources by 2050. They found that renewable energy could help reduce the electricity sector’s emissions by approximately 81 percent [ 5 ].