Sustainable Cost Has Been Defined by Gray and Bebbington As

Sustainable cost has been defined by Gray and Bebbington as:

A) the amount an organisation must spend to put the biosphere at the end of the accounting period back into the state (or its equivalent) it was in at the beginning of the accounting period.
B) the amount an entity is able to pay in a sustained way to repair damage to the environment and so achieve an acceptable level of inter-generational equity.
C) the cost of sustainable production levels including opportunity costs of production foregone.
D) the minimum amount that an entity will need to spend over the midterm to ensure that it meets its environmental commitments to bodies such as Environmental Protection Authorities.