 The expansion represents Summit's agreements with ethanol plants that had been linked to the abandoned Navigator CO2 pipeline project. Iowa has 42 ethanol plants and Summit's pipeline would collect carbon from 30 of them for underground storage in North Dakota. Radio Iowa, I'm O.K. Henderson. U.S. Senator Chuck Grassley applauded a recent U.S. Supreme Court decision overturning a nearly 40-year-old ruling making it easier for federal agents to interpret law regarding their field.