The PLA production using the algae “Chlorella Vulgaris” could help reduce environmental pollution caused by throwing away plastic and by absorbing CO2 harming our ozone layer. Cultivating the Chlorella Vulgaris, drying them, performing a hydrolysis with enzymes like maxilase and cellulase, executing a two-day fermentation using lactobacilli and finally doing a polymerization with SnCl2 does in fact produce polylactic acid. Using this sequence of processes on a bigger scale, our project should be able to protect the environment while producing bio-degradable plastic which has multiple purposes like (medical) packaging, toys and filaments for 3d-printing.