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题目材料：
Recently, controversial findings were released that suggest that the amount of carbon dioxide absorbed by United States forests might be greater than the amount emitted by the nation's fossil-fuel combustion. This conclusion has two astonishing implications. First, the United States may not be directly contributing to rising atmospheric levels of carbon dioxide. Second, the atmosphere seems to be benefiting from young forests, which are particularly efficient at absorbing carbon dioxide. But these young forests exist only because old-growth forests were clear-cut in earlier centuries. The possibility that the United States absorbs more carbon dioxide than it produces thus does not reflect efforts to protect the environment; rather, it reflects a history of deforestation and development.
以上解析由 考满分老师提供。
