By Hans Nicholas Jong JAKARTA — Farm-to-fork traceability has become an increasingly urgent, and often required, component of global supply chains, with a growing number of commodities now trackable all the way back to their source. But for palm oil, one of the most controversial yet widely used commodities today, full traceability from the plantation to supermarket shelves to households remains a challenge due to the complexity of the supply chain. A single ton of palm oil derivative like stearic acid, for instance, used in detergents and cosmetics, is likely to consist of palm oil from hundr…