While post-combustion capture at power plants may represent the best near-term opportunity for CO2 capture, there are other sources of CO2 in nature and industry. This analysis accounts for the environmental burdens of CO2 from three alternative sources: natural CO2 domes, natural gas processing plants, and ammonia production plants. This analysis uses a life cycle analysis (LCA) approach for developing data and modeling CO2 systems. The energy and material flows for key processes in the CO2 supply chain were calculated. These processes were then compiled in a model that scaled the flows between processes to arrive at an inventory of environmental burdens on a common basis (i.e., 1 kilogram of CO2 ready for compression and pipeline transport). A briefing is also included with the report.