*3.1. Composting*

The environmental impact of biowaste treatment by composting is summarised in Figure 5. The overall value of GWP burdens of biowaste composting is 94.9 kg(CO2)eq.twaste−<sup>1</sup> consisting from environmental burdens from collection and transport (16.9 kg(CO2)eq.twaste<sup>−</sup>1) and from the treatment itself (78 kg(CO2)eq.twaste−1). On the other side, a positive effect—GWP credits with a value of <sup>−</sup>152 kg(CO2)eq.twaste<sup>−</sup>1—result mainly from the substitution of primary resources such as fertilisers or substrates. The net GWP value of biowaste treatment, including transport and collection, is equal to <sup>−</sup>57.1 kg(CO2)eq.twaste<sup>−</sup>1.

**Figure 5.** The overview of the environmental impact of biowaste composting expressed using GWP via SEP-BIO.
