intrinsically and extrinsically renewed resources
There are two types of renewable resources: those that are renewed intrinsically and those that are renewed extrinsically. A resource that is renewed intrinsically regrows from within itself. A resource that that is renewed extrinsically is renewed from a source outside of itself.
A forest renews intrinsically. If it is harvested it renews by regrowing from within itself. Because an intrinsically renewed resource renews from within itself, it can be destroyed by over-harvesting.
A water spring is renewed extrinsically. If it is harvested it is renewed with water that comes from rain somewhere else. An extrinsically renewed resources is only ever available at a limited rate. An extrinsically renewed resource cannot be destroyed by over-harvesting; however, it can be destroyed by destroying the source from which it is renewed.
Examples of intrinsically renewed resources include:
- timber from a forest
- fish from a wild fishery
- energy from biomass
- fruit from plants
Examples of extrinsically renewed resources include:
- energy from sunlight
- energy from wind
- energy from geothermal
- water from a well.
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