Nitrous oxide is making a comeback for pain relief during childbirth. But charges for the option vary from free at some hospitals to thousands of dollars at others.
New research calculates the greenhouse gas emissions involved in making bread, from wheat field to bakery. The vast majority of emissions come from one step in the process: farming.
Move over, epidurals, here comes nitrous oxide. After enjoying popularity in the U.S. for managing labor pain until the mid-20th century, it was dropped in favor of anesthesia. Now it's back.