PHILADELPHIA — A wall of solar panels towered above a sea of green football jerseys as people filed into Lincoln Financial Field in Philadelphia for a recent Eagles home game. Inside, some fans snapped photos with an oversized Lombardi Trophy made out of recycled plastic collected from the stadium while others strolled to their seats carrying beverages in recyclable aluminum cups.
“These are real nice cups,” said Tre Simon, a fan who was impressed at how cold the aluminum cup kept his drink. …