以下为句子列表：
英文: Cellulosic ethanol is the great hope of many environmentalists since its carbon, unlike that in fossil fuels, comes from the atmosphere and thus cannot make a net contribution to global warming when it returns there.
中文: 许多环保论者对纤维素乙醇使寄以极大的希望，因为与化石能源不同，纤维素乙醇中的碳元素是来自空气之中，因此当它重新回到大气中，并不会加剧全球变暖。
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英文: Clarity around the full costs and net contribution of each program may appear at first glance to be heavily profit-focused.
中文: 乍看下来，对每个项目的总体成本和净收入的清晰了解似乎过于注重盈利。
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