The 2023 edition of the Plastic Waste Makers Index provides new estimates of the cradle-to-grave greenhouse gas emissions resulting from single-use plastics. This demonstrates that single-use plastics producers also contribute to the climate crisis. The index extensively examines each petrochemical company's use of recycled plastic waste as feedstock for new polymers and estimates their contribution to single-use plastic waste, excluding the material recovered for recycling. The impact on greenhouse gas emissions is negligible for most companies, but a few companies have a notable impact.