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Sustainable Development
A principle which states that a development plan must not compromise the welfare of future generations for the benefit of present generations.
Sustained winds
The wind speed obtained by averaging the observed values over a one minute period.
Sustained yield
An output of renewable resources that does not impair the productivity of the resource; it implies a balance between harvesting and incremental growth or replenishment.
Swampbuster
A provision of the Food Security Act of 1985 that discourages the conversion of wetlands to cropland use. Producers converting a wetland area to cropland lose eligibility for several federal farm program benefits. Benefits are lost from when water levels are lowered to facilitate agricultural production until they have been restored. Several types of wetlands and wetlands in specified situations are exempt. Exceptions include conversions that began before December 23, 1985, conversions of wetlands that had been created artificially, crop production on wetlands that became dry through drought, and conversions that USDA has determined have minimal effect on wetland values. Swampbuster provisions were amended in the FAIR Act of 1996 to provide greater flexibility for producers and landowners.
Swells
Ocean waves of regular and longer duration than wind waves.
Syncline
A fold of rock layers that is convex downwards. Antonym of anticline.
Synthetic fertilizer
Commercially prepared mixtures of plant nutrients such as nitrates, phosphates, and potassium applied to the soil to restore fertility and increase crop yields. See organic fertilizer.
Synthetic natural gas (SNG)
A manufactured product chemically similar in most respects to natural gas, resulting from the conversion or reforming of petroleum hydrocarbons. It may easily be substituted for, or interchanged with, pipeline quality natural gas.

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