CHICAGO — Fast deliveries are just a click away, all in a cardboard box. The I-Team and the Chicago Sun-Times discovered an extensive trail of excess waste that exposes your “Cardboard Footprint.” …The U.S. Department of Commerce says e-commerce sales for 2018 were more than $513 billion, an increase of more than 14 percent in a single year. …Amazon revealed that in 2017 it shipped more than 5 billion items worldwide, to Prime customers alone. The I-Team and Chicago Sun-Times wanted to know how all those cardboard boxes are stacking up. “It could add up to some significant impact. And the concern there is, if there is less cardboard available we need to go back to the raw material, which is trees. …”On average a corrugated box contains 49 percent recycled content, so when you recycle it you’re giving that box back to our industry,” said Racheal Kenyan.