It will take some time for Royal Dutch Shell’s U.S. subsidiary to shut down its research into producing crude oil from western Colorado’s underground oil shale reserves, according to company spokeswoman Carolyn Tucker.
Shell, which had been trying various ways to turn layers of rock called oil shale into crude oil since 1981, announced Tuesday the company would shut down its oil shale research operations in Colorado and turn its attention elsewhere.
But it’s not simply flipping the switch,…
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