difficulties ahead included a scarcity of natural resources such as land, water and biodiversity.
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There are many different ways to measure agricultural performance besides food yield: energy use, environmental costs, water purity, carbon footprint and biodiversity.
除了粮食产量之外，还有许多不同的方法来衡量农业表现：能源使用、环境成本、水的纯度、碳足迹和生物多样性。
Yet most relate to forests' role in the carbon and water cycles and in safeguarding biodiversity.
大多数仍和森林在低碳，水循环和保护生态平衡中的角色相关。
Forests catch and store water, stabilize soils, harbour biodiversity and make an important contribution to regulating climate and the greenhouse gases that are causing climate change.
森林聚水蓄水，稳定土壤，涵养多种生物，并对调节气候以及造成气候变化的温室气体做出重要贡献。
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