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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相反，它决定于生产和运输思想。

Instead, it depends on generating and transporting ideas.

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你要看按生产和运输的能量算这些作物是怎样生产的。

You have to look at how these crops are produced in terms of the energy used for growing and transport.

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