I'm concerned about growing hills of Spent Shale: https://en.wikipedia.org/wiki/Oil_shale_coke
Quote:
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Depending on the extraction process and the amount of remaining organic matter, spent shale may be classified as oil shale coke, semi-coke or coke-ash residue, known also as oil shale ash.[1][2] According to the European Union waste list all these types of spent shale are classified as hazardous waste.
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