Use of contour buffer strips in commodity crop systems in southwestern Wisconsin helps reduce soil loss and traps nutrients on slopes. Photo courtesy of Wisconsin Farm Bureau Federation.
Used to describe energy sources that are replenished by natural processes on a sufficiently rapid time-scale? so that they can be used by humans more or less indefinitely, provided the quantity taken per unit of time is not too great.

Use of contour buffer strips in commodity crop systems in southwestern Wisconsin helps reduce soil loss and traps nutrients on slopes. Photo courtesy of Wisconsin Farm Bureau Federation.