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All terms in this list:

Accelerate: To quicken the natural or ordinary progression or process of.

Alternative: A choice between two or more mutually exclusive possibilities.

conserve: Wilderness where human development is prohibited.

desalination: The process of removing salt from sea water in order to make drinking water.

drought: A period of below average rain fall, longer and more severe than a dry spell

Dustbowl: The central region of the United States during the 1930s.

Encroachment: An entry into a place or area that was previously uncommon; an advance beyond former borders; intrusion; incursion.

Energy: The impetus behind all motion and all activity.

erosion: The changing of a surface by mechanical action, friction, thermal expansion or contraction, or impact.

forest: A dense collection of trees covering a relatively large area. Larger than woods.

fragile: easily broken or destroyed, and thus often of subtle or intricate structure

Great Depression: A major economic collapse that lasted from 1929 to 1940 in the US and a similar period in many other countries.

polluted: Defiled; made unclean or impure; debauched.

productivity: the state of being productive, fertile or efficient

recycling: The practice of sorting and collecting waste materials for new use.

reforestation: The act or process of replanting a forest, especially after clear-cutting.

replenish: To refill; to renew; to supply again or to add a fresh quantity.

significant: sufficiently great or important to be worthy of attention.

soil conservation: Protection of the soil against sediment loss by erosion or fertility loss due to degradation.

Soil-conservation service: Was formed to educate america's farmers about good soil management.

Topsoil: The most fertile soil, easiest to start new plants in.

USDA: United States Department of Agriculture

Vocation: an inclination to undertake a certain kind of work, especially a religious career; often in response to a perceived summons; a calling.

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Definitions from Wiktionary under the GNU FDL.
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