![[Land Use and Conservation]](../gfx/title/landuse_title.gif)
The surface of the planet is changing. Scientists estimate that humans have transformed from a third to a half of the Earth's land surface through deforestation, agricultural conversion, urban sprawl and other activities. While humans need land for food, shelter and other essentials, they frequently use land in ways that diminish its ability to support human needs in the future. Land conversion also is threatening valuable "natural services." Wetlands loss, for example, is undermining water quality and increasing flood risks. Transformations of natural habitat also are imperiling a growing number of other species, who are important in their own right and who provide inspiration, delight, and often economic value to humans. Society's challenge is to learn how to use land in ways that are sustainable.
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