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Summit Carbon Solutions is asking Iowa regulators to amend its carbon dioxide pipeline permit to explore sequestration sites in other states.

Opponents, including landowners and environmental groups, are challenging Summit's Iowa permit in court.

A judge is deciding whether to review the existing permit or send the case back to regulators to consider the proposed changes.

With Summit Carbon Solutions’ planned route effectively blocked by South Dakota’s ban on the company's use of eminent domain, opponents question where it intends to sequester the carbon dioxide a $9 billion pipeline it proposes would collect from Iowa and other Midwestern ethanol plants.

The sequestration site is supposed to be in North Dakota, but reaching that state is problematic without runnin

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