About the same CO2 impact as manufacturing them. The problem is burning it clean. To do that you have to run a very hot furnace, near gasification temperatures

About the same CO2 impact as manufacturing them. The problem is burning it clean. To do that you have to run a very hot furnace, near gasification temperatures. Otherwise, you will be releasing cracked chlorine, sulphate, partial urethane chains and other hydrocarbons into air. They're invisible but noxious and sometimes stinky. Electroscrubbers have limitations and high energy cost too.