unless it profitable
除非有利可图
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Even on the (optimistic) assumption that the police try their best, efforts to stop deforestation may fail unless it becomes more profitable for people who control the forest to leave trees intact than it is to cut them down.
ECONOMIST: Global consensus on climate change is maddeningly elusive
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