As soon as the batch is used up, the process of picking a filament has to be repeated. Clearly, while the laboratory process shows that it is possible to produce filaments easily, industrial processes have to be found that make a more reliable filament in a continuous process. To do this the threads are extruded, not drawn. The natural carbon cycle. The main source of carbon dioxide is the air.
Plants make sugars by photosynthesising sugars using carbon dioxide from the air.
As sugars are oxidised by plants for energy, carbon dioxide is released back into the air. As sugars are oxidised by animals for energy, carbon dioxide is released back to the air. Organisms in the soil break down dead plant and animal tissue, and carbon dioxide gas is released as it decays. Carbon-based chemicals are absorbed by animals as they consume plant matter. It is released when fossil fuels are burned.