This report examines the climate impact of primary plastic production, focusing on the contribution of different polymer types to greenhouse gas (GHG) emissions. It provides a detailed analysis of the emissions from the production of nine major plastic polymers, including polyethylene (PE) types, polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polystyrene (PS), and other key styrene-based plastics, as well as polyurethane (PU). These polymers account for about 80% of global plastic production. In 2019, primary plastic production generated approximately 2.24 gigatonnes of carbon dioxide equivalent (GtCO2e), representing 5.3% of total global GHG emissions (excluding agriculture and land use, land-use change and forestry). Emissions from primary plastic production come from the combustion of fossil fuels for process heat and electricity, as well as from other non-combustion processes. Approximately 22%, 21%, and 15% of emissions related to primary plastic production in 2019 come from all PEs together, PET, and PP, respectively. Other key plastics, such as PVC, PS, SAN, ABS, and PU, are responsible for around 23% of global emissions from plastic production. Under a conservative growth scenario (2.5% per year), GHG emissions from primary plastic production would more than double to 4.75 GtCO2e by 2050, accounting for 21-26% of the remaining global carbon budget to keep average temperature increases below 1.5°C. At 4% per year growth, emissions would increase more than three times to 6.78 GtCO2e, accounting for 25-31% of the remaining global carbon budget for limiting global warming to 1.5°C. The report highlights the significant contribution of primary plastic production to climate change and emphasizes the need for a comprehensive understanding of GHG emissions from plastic production to inform global climate negotiations and the development of a global plastics treaty. The findings underscore the importance of addressing the climate impact of plastic production in the context of global climate goals.This report examines the climate impact of primary plastic production, focusing on the contribution of different polymer types to greenhouse gas (GHG) emissions. It provides a detailed analysis of the emissions from the production of nine major plastic polymers, including polyethylene (PE) types, polypropylene (PP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), polystyrene (PS), and other key styrene-based plastics, as well as polyurethane (PU). These polymers account for about 80% of global plastic production. In 2019, primary plastic production generated approximately 2.24 gigatonnes of carbon dioxide equivalent (GtCO2e), representing 5.3% of total global GHG emissions (excluding agriculture and land use, land-use change and forestry). Emissions from primary plastic production come from the combustion of fossil fuels for process heat and electricity, as well as from other non-combustion processes. Approximately 22%, 21%, and 15% of emissions related to primary plastic production in 2019 come from all PEs together, PET, and PP, respectively. Other key plastics, such as PVC, PS, SAN, ABS, and PU, are responsible for around 23% of global emissions from plastic production. Under a conservative growth scenario (2.5% per year), GHG emissions from primary plastic production would more than double to 4.75 GtCO2e by 2050, accounting for 21-26% of the remaining global carbon budget to keep average temperature increases below 1.5°C. At 4% per year growth, emissions would increase more than three times to 6.78 GtCO2e, accounting for 25-31% of the remaining global carbon budget for limiting global warming to 1.5°C. The report highlights the significant contribution of primary plastic production to climate change and emphasizes the need for a comprehensive understanding of GHG emissions from plastic production to inform global climate negotiations and the development of a global plastics treaty. The findings underscore the importance of addressing the climate impact of plastic production in the context of global climate goals.