ACT English

Practice session

Read the following passage excerpt and answer the question: "The Amazon rainforest is often called the 'lungs of the Earth' because it absorbs vast amounts of carbon dioxide. Deforestation threatens to reduce this capacity significantly. Scientists estimate that the Amazon currently sequesters approximately 2 billion tons of carbon per year. [1] Some researchers warn that continued deforestation could trigger a 'tipping point' beyond which the forest could no longer sustain itself." At point [1], the writer wants to add a sentence providing a specific example of deforestation's impact. Which addition is MOST appropriate?

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