 To put the point in other words, the key concern is about “substitutability” (Neumayer 2003: 37–40). The question is whether one can substitute the loss of nature with the provision of other goods. Different accounts of justice will yield different answers to this. This take us to a long-standing debate in ecological economics and ethics between proponents of what has been termed “weak sustainability” (which permits the substitution of capital for the loss of nature) and proponents of “strong sustainability” (which denies the possibility of such substitution) (Neumayer 2003).