n: A reduction of an ecosystem's or habitat's ability to support its natural biota. 2. Depletion or destruction of a potentially renewable resource such as soil, grassland, forest, or wildlife by using it at a faster rate than it is naturally replenished. If such use is continued, the resource can become nonrenewable (on a human timescale) or nonexistant. 3. Pollution, toxification, or other alteration of an environment that makes it less productive, hospitable, usable, or enjoyable.