For example, this was the case for arid and semi-arid areas where lawn irrigation and planting changed the ecosystems from shrub lands and desert to deciduous forests.

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As population increases we are going to have to rely on our soil resources more and more. Because of their style of consumption, in Europe the amount of land needed to support urban areas is 100 times larger than the urban area itself.

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In countries like Egypt, where there is not much arable land and all the urbanization is taking place along the Nile River, in terms of local food supply it is a serious issue.

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