Darling Ingredients Inc. is the world’s sustainability giant that turns food waste into sustainable products and renewable energy producers. Chick-fil-A Inc. has collaborated with Darling Ingredients, which would help the fast-food restaurant transform its cooking oil into cleaner-burning renewable transportation fuel. The service brand of Darling Ingredients, DAR PRO Solutions, would collect used cooking oil from Chick-fil-A’s US and Canadian restaurants.