Read the quotation from a 1908 speech by Theodore Roosevelt and answer the question. We have become great because of the lavish use of our resources. But the time has come to inquire seriously what will happen when our forests are gone, when the coal, the iron, the oil, and the gas are exhausted, when the soils have still further impoverished and washed into the streams, polluting the rivers, denuding the fields and obstructing navigation. The concerns expressed by Roosevelt in this quotation led him to focus on which of the following as president of the United States?

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