Sustainable biomanufacturing must begin in process development, not after commercial production starts. Most environmental impact is locked in during technology selection, process design and supply chain planning, long before the first batch runs. By the time a plant operates, the biggest choices are already made. Sustainability should not start after manufacturing starts; it should start while the process is still being designed. Why the factory's energy bill is not the whole story When biopharma companies talk about green manufacturing, the usual list runs: energy saving, water saving, solar power, packaging optimization, waste management and green logistics. These measures all matter. But for biological drugs, a better question is how much room remains to change resource consumption after a process has been commercialized. For sustainable biomanufacturing, the honest answer is usually: not much. This is green bioprocessing by design. Many environmental impacts are not created du...