Environmentally, using waste walnut oil or meal byproducts supports circular production and reduces food waste. However, cultivating walnuts solely for biodiesel is resource-intensive, involving high water and land use. Economically, walnut oil is costly, limiting feasibility unless low-cost or recycled inputs are available. Scaling up requires evaluating regional supply chains, co-products, and equipment costs. The GlobeCore USB system offers modular scalability, low energy usage, and high efficiency, making small or specialty biodiesel production from walnut oil viable in the right context.