Cedar Rapids Gazette: Navigator Heartland Greenway this week became the second developer of a carbon dioxide sequestration pipeline to ask Iowa regulators to allow it to use eminent domain to force landowners to sell it easements for the underground hazardous pipeline route. In a filing Tuesday with the three-member Iowa Utilities Board, Navigator asked for a permit to build its C02 pipeline, which would generally stretch from northwest to southeast Iowa for 811 miles along its 1,300-mile route across five states.