Rebecca Black and Roy Smith, both 44 and native Californians, get to work soon after sunrise. By 7:30 a.m., they’re busy in the cottage they rent on Old Redwood Highway in Cotati, where they live with their two daughters, Siena Smith, 11, and Lillian Black, 12. This morning, Smith skins and guts a 13-year-old goat, chops up the liver to feed the cats and dogs and saves the best parts for a family meal. Meanwhile, in the backyard, Black tans the goat’s hide. In this super eco-driven household, almost nothing goes to waste. Nearly everything is recycled and everyone is...