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This research is conducted to assess and create some scenarios in the sugar industry, which aimed to decrease the production of CO2 emissions in PT Madubaru. In this research, the assessment of CO2 emission is based on the energy consumption used in supply chain activities during the production period in 2014. The problem faced in this research is the used of energy for transportation and production in a complex condition. Thus, simulation modeling based on system dynamic has been proposed to build the assessment model and create a scenario. The result shows that PT Madubaru produces around 174,246,500 kg in 171 days or during the production period in 2014. It means that the amount of CO2 emission in a day is around 1,018,985 kg. Two scenarios haves been developeded in order to reduce CO2 emissions. First, changing the old type boiler with the new one by increasing 155% fuel efficiency. This scenario is proven to reduce the amount of CO2 by 44% or become 98,800,400 kg. Second, eliminating the use of lorry which reduce the 0.2% of CO2 emission or equal to 387,600 kg.