A second and perhaps bigger source of concern is the housing market.
住房市场是第二担忧，或许其程度还要更大。
2
Buildings are responsible for about half the world's emissions; domestic housing is the most important single source of greenhouse gases.
建筑物释放的气体占了全世界排放总量的一半，民用住房是温室气体的一大重要来源。
3
The interior spaces feature room for housing, offices, scientific laboratories, and entertainment, and a series of bioremediating vegetable gardens provide a source of food while recycling waste.