This chapter talks about making plastics in a way that’s better for the environment by using materials like recycled plastics, plants, and CO2 instead of oil and gas. These new feedstocks help protect the climate and ensure we have enough resources for the future. A key part of this change is the mass balance approach. This method keeps track of how much of these new feedstocks are used in making plastics. It makes sure that products stay high-quality while becoming more sustainable. The chapter also explains how this approach fits with European laws that encourage using recycled materials. Using the mass balance method is important for getting investments in recycling technologies and meeting sustainability goals. Overall, this chapter gives a clear picture of how we can make plastic production greener. It highlights the need for new ideas and support from laws to achieve a circular economy, where resources are reused and recycled.