Graphic Packaging Holding said it will spend $1 billion to build a new plant to turn old cardboard into new boxboard, doubling down on its bet that concerns about plastic waste have created opportunities for paper packaging. The paperboard mill in Waco, Texas will follow the opening early last year of a similar plant in Kalamazoo, Mich., which was the first new coated-recycled paperboard line to be built in the U.S. in decades. Construction is expected to begin later this quarter and start-up is