I do not know what the second part of the sentence means. Is there anything in the whole article that would provide a clue?
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GPYObviously "impacts" refers to "environmental impacts", but the difficulty for me is understanding the sense in which "economical" is meant.Yes, that's the problem I had. Since it is an abstract of the original article there is no further explanation of what is meant. The original article may have made it clear. Perhaps the author was trying to suggest that
soheil1Or not being extravagent with the use of materialsHowever, the thing described as "economical" is the "allocation of impacts", which to me does not seem to fit that interpretation very well.
soheil1Why?Because I don't see that "allocation of (environmental) impacts" has much to do with not being extravagant with use of materials.