瑞典先进的废水处理、污泥处理和沼气汽车技术，系统性介绍废水处理和有用材料/能源回收系统。
Swedish advanced technologies for waste water treatment, sludge treatment and biogas vehicles, systematic systems for waste water treatment and recycle of useful materials/energy.
许多城市允许消费者购买纸袋，这些纸袋很容易回收，但会消耗更多的能源来生产。
Many cities allow shoppers to purchase paper bags, which are easily recycled but require more energy to produce.
许多有禁令的城市仍然允许消费者购买纸袋。虽然纸袋很容易回收，但生产和运输需要更多的能源。
Many cities with bans still allow shoppers to purchase paper bags, which are easily recycled but require more energy to produce and transport.
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