How high would trash mountains be if all the trash was piled into 1 continent like Antarctica? https://michielkauwatjoe.com/images/works/trash-mountain-michielkauwatjoe.com-large.jpg
closed as too broad by Chickens are not cows, L.Dutch♦ Apr 26 at 19:24
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Piling trash next to cities has been done, e.g. https://en.wikipedia.org/wiki/Mount_Trashmore_Park and https://en.wikipedia.org/wiki/Mount_Trashmore_(Florida) It's much more common to put it in a hole - AKA landfill - and cover it.
The problem with piling all the trash of a continent in one place is obviously the cost (and environmental effects) of transporting it. You could calculate the cost yourself by finding estimates of how much trash is generated by your continent, picking a location, and looking up ton-mile transport costs.