It would hit Alina Black at Trader Joe’s, a wave of guilt and shame that made her skin crawl. Something as simple as nuts. They came wrapped in plastic, often in layers of it, that she imagined leaving her house and traveling to a landfill, where it would remain through her lifetime and the lifetime of her children. She longed, really longed, to make less of a mark on the earth. At the age of 37, these conflicting forces were slowly closing on her, like a set of jaws. In the early-morning hours, after nursing the baby, she would slip...