Polymers that use fewer resources can make an effective contribution to more sustainable rubber products. Polyether ester carbonate urethane rubbers (PECU) are such polymers. The comprised polyol consists of approx. 20% CO2, which is copolymerised as carbonate and thus reduces both the carbon footprint and the use of fossil resources. However, as the resulting rubbers have unique properties (e.g. viscosity), mixing and further processing are subject of current investigations. The processability of rubber mixtures and further processing into foams, extrudates or into injection moulded parts has been successfully demonstrated.