Lately, I’ve been thinking about canning lids and the things we throw away without giving them much thought. The idea came back to me when I opened two jars of beans and two jars of tomatoes to make a batch of chili. By the time I had everything simmering on the stove, four metal canning lids were headed for the trash. And it bothered me. Four jars. Four lids. Used once and thrown away. Not enough to stop making chili, of course. But enough to make me wonder why we have become so accustomed to treating perfectly useful things as disposable. A standard two-piece canning lid is designed to be…