In order to allocate resources to meet human needs, and respond to their own advantage, but does not preserve the resource for the benefit of future descendants continue to investigate. All of those resources.
To allocate resources to meet human demands. And cater to their own advantage. But not all storage resources for the benefit of their sons in the future. Those resources that Leaving only ruins are left with a fraction of the resources available.
In the allocation of resources to meet the needs of human priority And cater to their advantage But do not maintain resources to benefit children continue in the future. Those resources