Waste sorting and its effects on carbon emission reduction: Evidence from China

Considering the importance of waste sorting and treatment in the development of an ecological civilization, empirically evaluating the environmental impact of such programs is particularly important. This study uses Xiao'er Township in Gong County, Sichuan Province, China as a case study to analyze and estimate the carbon emission reduction effects of the township's pilot waste sorting program. Using the five-point sampling method, samples of waste are collected, reviewed, and measured for their major components and other key indicators. Additionally, questionnaire surveys and interviews are conducted in the township, along with investigations into existing records and other relevant information. The study adopts the solid waste management-greenhouse gas (SWM-GHG) calculator to study the township data. The case study results imply that proper waste sorting and treatment methods in villages and townships could play a major role in the reduction of carbon emission. Specifically, after implementing waste sorting in Xiao'er, annual carbon emissions were reduced by 2081 tons—equivalent to the electricity consumption of a family of three people for 1718 years, or the amount of CO2 emitted by 264 1.6L vehicles driving once around the Earth. In the optimal scenario simulation, increasing the recycling of wet waste and recyclable waste further, the level of carbon emission reduction in Xiao'er could reach up to 4482 tons per year. According to the international general carbon trade price, this is equivalent to adding 44,820 US dollars to the GDP, or to an annual saving of 5.71 million kWh. If these waste management methods are expanded to villages and townships across China, then the carbon emissions reduced in a year would be equal to the CO2 emitted from electricity generation in Beijing for over a year. Based on these findings, this paper provides three policy recommendations for effective carbon emission reduction: increasing residents' environmental protection awareness over the long term, boosting funding support and enhancing the construction of supporting facilities, and strengthening governance and institutional capacity for waste sorting and treatment.