Multi-gas processing and transport system

A gas processing and transport system comprising a natural gas pipeline (1), a plurality of gas conditioning stations (4) connected to the natural gas pipeline between an upstream main natural gas supply and a downstream consumer end, the gas processing stations including carbon dioxide producers and carbon dioxide consumers, the carbon dioxide producers including natural gas consumers, at least one control system (10), and at least one sensor connected to the control system. At least one of the gas processing stations producing carbon dioxide is configured to inject produced CO2 into the natural gas pipeline, and at least the gas processing station(s) consuming natural gas comprise(s) a gas separating membrane (5) configured for separating at least CO2 from CH4.