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Plastic waste in Indonesia has become global issues, where Indonesia itself has been stated as the second plastic waste polluter in the world. Semarang City, as one of the major cities in Indonesia, is facing plastic waste problems. Reverse logistic network for plastic waste recycling seems to be used as alternative method to reduce the emissions of plastic waste recycling. In this study, the reverse logistic network of plastic waste is evaluated based on the estimation of greenhouse gases (CO2, CH4 and N2O) generated from recycling activities. The results showed that the largest GHG emissions came from plastic waste grinder (intermediates) for about 0.513 Tonne CO2eq/day. According to the calculations, the optimal number of recycling businesses is 224 units of scrap dealers, 358 units of small scale entreprises, 23 units of large scale entreprises, and 18 units of grinders. Total greenhouse gases produced from the 623 recycle business units are 0.932 Tonne CO2eq / day. Optimization of existing reverse logistics scenarios is needed to evaluate greenhouse gas emissions before and after optimization.