https://www.economicshelp.org/blog/143879/economics/environmental-sustainability-definition-and-issues/
https://link.springer.com/article/10.1007/s40866-019-0063-3
https://www.mackinac.org/2843
https://www.google.com/search?q=radition+def&rlz=1C1CHBD_esMX752MX752&oq=radition+def&aqs=chrome..69i57j0i10i457j0i10l6.3767j1j7&sourceid=chrome&ie=UTF-8
http://www.nppfdubai.com/blog/why-is-styrofoam-a-good-insulator/
https://katus.eu/learn/courses/eco-friendly-house-ingredients?r_done=1
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