Renewable resource

A renewable resource is an organic natural resource which can replenish to overcome usage and consumption, either through biological reproduction or other naturally reoccurring processes. Renewable resources are a part of Earth's natural environment and the largest components of its ecosphere. A positive life cycle assessment is a key indicator of a resource's sustainability.

Definitions of renewable resources may also include agricultural production, as in sustainable agriculture and to an extent water resources. In 1962 Paul Alfred Weiss defined Renewable Resources as: "The total range of living organisms providing man with food, fibres, drugs, etc...". Another type of renewable resources is renewable energy resources. Common sources of renewable energy include solar, geothermal and wind power, which are all categorised as renewable resources.

Food and water

Water resources

Water can be considered a renewablematerial when carefully controlled usage, treatment, and release are followed. If not, it would become a non-renewable resource at that location. For example, groundwater is usually removed from an aquifer at a rate much greater than its very slow natural recharge, and so groundwater is considered non-renewable. Removal of water from the pore spaces may cause permanent compaction (subsidence) that cannot be renewed. 97.5% of the water on the Earth is salt water, and 3% is fresh water; slightly over two thirds of this is frozen in glaciers and polar ice caps. The remaining unfrozen freshwater is found mainly as groundwater, with only a small fraction (0.008%) present above ground or in the air.

Ply

Ply, Pli, Plies or Plying may refer to:

See also

Éply

Éply is a commune in the Meurthe-et-Moselle department in north-eastern France.

See also

PLY (file format)

PLY is a computer file format known as the Polygon File Format or the Stanford Triangle Format.

The format was principally designed to store three-dimensional data from 3D scanners. It supports a relatively simple description of a single object as a list of nominally flat polygons. A variety of properties can be stored including: color and transparency, surface normals, texture coordinates and data confidence values. The format permits one to have different properties for the front and back of a polygon.

There are two versions of the file format, one in ASCII, the other in binary.

The File Format

A complete description of the PLY format is beyond the scope of this article - but one may obtain a good understanding of the basic concepts from the following description:

Files are organised as a header, that specifies the elements of a mesh and their types, followed by the list of elements itself, usually vertices and faces - potentially other entities such as edges, samples of range maps, and triangle strips can be encountered.