B

A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

Biologically productive earth surface

Biologically productive area is land and water (marine and inland) areas that can be used in a meaningful way by humans. Non-productive and marginal areas such as arid regions, open oceans, ice-fields, and other areas of low productivity are not included.
(in "Sustainable Development")