Strong sustainability refers to:
a. restoring critical environmental resources to higher levels than simply maintaining them.
b. maintaining critical environmental resources at current level.
c. developing new technology to maintain environmental resources.
d. maintaining a few environmental resources at lower then current level.
Answer is a. restoring critical environmental resources to higher levels than simply maintaining them. (Under the strong sustainability criteria, minimum amounts of a number of different types of capital economic, ecological, social should be independently maintained, in real physical/biological terms. This implies that nature has a right to exist and that it has been borrowed and should be passed on from one generation to the next still intact in its original form. )
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