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Kiviõli, Estonia - February 22, 2020: An Estonian flag flies from atop one of the many shale oil ash hills that dot the landscape in northeastern Estonia. These artificial hills are made from the waste ash produced when oil shale, a sedimentary rock that is abundant in the region, is processed into power or oil.
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JOEL CARILLET
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Estonia
Kiviõli, Estonia - February 22, 2020: An Estonian flag flies from atop one of the many shale oil ash hills that dot the landscape in northeastern Estonia. These artificial hills are made from the waste ash produced when oil shale, a sedimentary rock that is abundant in the region, is processed into power or oil.