CO2 extraction techniques, how many are there and how effective are they?

I recall watching some time back about Carbon Sequestration, and reading about a couple others. I was curious if there was anyone here who has looked into this?

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Imagine my disappointment to learn this thread is about sequestration and not extracts


Carbon Sequestration is only one of the techniques that’s out there.

CO2 is also essential for safe cannabis extraction techniques. It’s also the only legal solvent in Missouri for such use. Flammable gases like butane are prohibited.

CO2 does have different industrial applications, dry ice, fire extinguishers, etc. What I am looking for here pertains to applications that are trying to deal with the environmental concerns with CO2.