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题目材料：
Because coal contains toxic materials such as arsenic and lead, and its use contributes to air pollution and acid rain, one might therefore conclude that no good case could be made for burning it for fuel. But that depends on where one is starting from. Switching to coal from firewood is beneficial for both the environment and the health of the individual. Firewood use results in deforestation, loss of ecosystems, and degradation of soil quality. Wood fires are also sooty, and their particulates contribute to global warming by decreasing the reflectivity of snowfields. Finally, firewood is generally burned in homes with poor ventilation and poses a greater health risk to the individuals than they would experience from a coal-fired utility that provides electricity to their homes.
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以上解析由 考满分老师提供。
