What are some antonyms for the word environment

There are none. But, as far as synonyms, there is,

ambiance , aura , backdrop , background , circumstances , climate,  conditions , context , domain , element , encompassment , entourage , habitat , hood , jungle , locale , medium , milieu , neighborhood , purlieus , scene , scenery, setting , situation , status , stomping ground , surroundings , terrain , territory , turf,  zoo

Credit to : Dictionary.com

social status of early civilizations was based primarily on economic power.- true ( first choice)