Wetlands have a big effect on groundwater, the amount of water below the surface of the land.

湿地对地下水，即地表以下的水量影响很大。

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First, as they grow taller, big trees become thicker and less flexible: when winds blow across the surrounding cleared land, there is nothing to stop their acceleration.

首先，随着大树长高，它们变得越来越粗、越来越不灵活：当风吹过周围的空地时，没有什么可以阻挡它们加速。

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The land is big and mostly flat with many fields of corn, wheat and soybeans. But as we travel west, the cropland gives way to wild grasses.

这片土地很广阔，也很平坦，其主要农作物是玉米、小麦和大豆，但我们再往西，从农田的小道，我们来到了一片野草地。

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Then they began to die. In some of the gold centers, big mining companies bought up all the land from those who first claimed it.

VOA: special.2010.03.18

And in sub-Saharan Africa, where only four percent of the land is irrigated, buying a small pump can make a big difference.

VOA: standard.2010.08.09

While big plantations provide jobs, rights groups say they drive the price of land higher, and force many small farmers off their land.

VOA: standard.2010.06.02

It increases state control over the economy, limits the size of big land holdings and redistributes revenues from the important gas fields in the eastern lowlands to poorer parts of the nation.

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In contrast, the Big Hole River talked with the land as it wound its way through the valley, collecting creeks as it went, quietly taking the path of least resistance.

NPR: Excerpt: 'The Selected Works of T.S. Spivet'

Land use has also changed over the last 10 years including a big fall in the number of sheep grazing the land.

BBC: Snowdon getting 'warmer and wetter' says 15-year survey