We are living in the time of aging of almost all societies in the world. There are at least two long-term causes of aging world and a temporary blip that will continue to show up in the figures for the next few decades. The first of the big reasons is that people everywhere are living far longer than they used to. A second and bigger cause of the aging of societies is that people everywhere are...

The populations of West African countries continue to grow at rates exceeding three per cent per year. The international food price spike of 2008 focused attention on the risks to national security and livelihoods associated with importing significant quantities of food; and government and donor investment strategies now focus on ensuring national food security. Since rice is a key staple crop ...

abstract in current study, an irrigation examination and acquisition of environmental water in kor-river fields, that is dominated from doroudzan dam to bakhtegan lake, was done by an integrated economy-environmental model. the model was considered by economic, hydrologic and agronomic components. in the economic component, an optimal harvesting of water was done using non-linear programming in...

Indigenous tourism is a term commonly used to describe that involves indigenous peoples or first nations in tourism. In recent years, research attention on this topic has broadened and expanded greatly, reflecting both increased involvement of their more active participation controlling utilising widening range economic development. This taken beyond its traditional role as limited source emplo...