Appropriate technology - Technology that is suited to the needs, skills, knowledge and wealth of the local people in the environment in which they live. Simple ideas with cheap readily available materials. , Biodiversity - The variety of life in the world or a particular habitat., Desertification - The process by which land becomes drier and degraded, as a result of climate change or human activities or both. , Hot desert - Parts of the world that have high average temperatures and very low precipitation., Mineral extraction - The removal of solid minerals from the Earth- ores, precious stones, solid fuels. , Over cultivation - Exhausting the soil by over- cropping the land., Overgrazing - Grazing too many livestock for too long on the land so it is unable to recover its vegetation.,

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