To calculate this we need to know some figures about the Earth. It has a surface area of 51 billion ha of which 36.3 billion ha is sea and 14.7 billion ha is land. Of the total land area only 8.3 billion ha is biologically productive. The remaining is either covered by ice or has unsuitable soils or lack of water.
Considering the current human population and the total land area there comes less than 2 ha of land per person. This is the per capita ecological capacity of the world as such. It will vary from country to country depending on the population and the goegraphical area of that country. Do not forget that while calculating this figure we have not left any land for the use of other animal and plant species existing on this Earth. JUST THINK!!!
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