Abstract
It is proposed to calculate the value of ecosystem services by the annual increase of work capacity or eco-exergy. The annual increase of biomass for various ecosystems is known. By multiplication of the biomass increase by the average content of information as Kullbach's measure of information, in the various ecosystems, the eco-exergy or total work capacity is obtained. An economic value can be found by multiplication of the cost of work, which is about 1 EURO-cent per MJ. A comparison of this value with the values found by Costanza et al. (1997) shows that the value based upon the total work capacity is much higher. The ratio between the two economic values have been found for the various ecosystems. It has been found that the ratio is lower the more an ecosystem by a wide range of application possibilities is utilized. The ecosystems have been divided in five classes according to the ratio and thereby in accordance to our utilization of the total work capacity of various ecosystems.
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