When we talk about saving the planet, we usually talk about the future. We talk about switching to electric cars, inventing new biodegradable plastics, and building massive solar farms. We tend to view “sustainability” as a modern invention, a brand-new concept we are scrambling to figure out before time runs out. But what if the blueprint for a greener world isn’t actually in the future but is hidden in the stories of the past? It is widely believed in Indonesia that rice fields are an...