- https://worldschildrensprize.org/litterfacts
- https://www.biostoffe.at/index.php?route=product/category&path=198
- https://www.alibaba.com/product-detail/Eco-friendly-recycled-polyester-RPET-plastic_62203785899.html?spm=a2700.7724857.main07.314.77d952a57lxMg7
- https://german.alibaba.com/g/recycled-polar-fleece-fabric.html