that should work. The CO2 simply replaces the space left by extraction of CH4.They do indeed. But those outside looking in claim otherwise!
And carbon capture, as being promoted, I find deeply questionable. Schemes like pumping down oil wells. If it leaks out, we could be worse off. Only tightly bound can it possibly work. Like a new Cretaceous period!
After all, a reservoir is just a big pressurised bottle.