When you buy carpet made from plastic bottles or doormats made from tires, you're helping "close the loop" on waste. Look for labels that indicate a product contains recycled content. Post-consumer content (materials that otherwise would have been thrown away) is thought to be greener than preconsumer content, which refers to waste collected during manufacturing. Products labeled recyclable have the most meaning when they're necessary purchases or have a short life span. For example, it's more important to be able to recycle a glass food jar than a vase.