Instead of oil feedstock, as in conventional manufacturing, plastic can be made from fermentation, rather like brewing beer. Bio-based latex car tyres can be made from dandelions and carpets from sugar. Right now we are still deeply dependent on petroleum products. But the idea of making chemicals in microorganism factories instead of oil refineries is taking off. This will mean a cleaner, more sustainable future for manufacturing.
Source: Why the bioeconomy could be the future of sustainable manufacturing | World Economic Forum