What to replace?

[dimpy.handa]

Well,man requires air,water and food to live,i was wondering with global warming and other factor which one of our need can be eliminated or replaced completely,i think food can be replaced as we can live without food for few days!!!!

 

[dimpy.handa]

I would really say none of them. So far alternate means of resources and generation of the items have been mentioned. You are still being dependant on the resource

 

[vardhanvishnug]

None of them can be replaced completely ,they are the basic human requirements and life is not possible without them

 

[Malika.Munjal]

Well,all the three are quite basic need for the human nature without which it cannot survive.. and regarding the argument of "replacing food".. how many days can u actually live without food?