我们应当照某些科学家建议的那样，将我们的环保预算花费在把世界屋脊涂成白色或是用太阳能板填满撒哈拉沙漠上吗？
Should we, as some scientists have suggested, spend our environment budgets on painting the world's roofs white or filling the Sahara with solar panels?
尽管如此，与其他能源相比较，风能的环保资质是足够令人信服的：不产生残渣，无须用水，而且(不像太阳能板)占地空间很小。
Yet, compared with other power sources, the green credentials of wind are pretty convincing: it creates no waste, USES no water and (unlike solar panels) doesn't need much room.
从混合动力车到太阳能板，更加环保的替代产品代价也更高。
From hybrid cars to solar panels, environmentally friendly alternatives can cost more.
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