Abstract: A biodegradable textile yarn made from recycled materials is disclosed, comprising a biodegradable, recycled polyethylene terephthalate (bio-rPET) fiber blended with a recycled natural fiber. The bio-rPET fiber is made from a recycled PET (rPET) and a biodegradable PET additive to make the rPET biodegradable. The biodegradable PET additive is between 0.5 and 3 weight % of a total weight of the biodegradable PET fiber. The bio-rPET fiber is more than 1 weight % inclusive of a total weight of the biodegradable textile yarn. Further disclosed are a biodegradable textile made from the biodegradable textile yarn, and systems and methods for making the biodegradable textile yarn. Also disclosed are benefits of the new biodegradable textile yarns, and alternative embodiments.