As Tom mentioned below everything is a political issue.
Both sides want to win the political game. So they argue over straw men.
Its difficult if not impossible to sort out the wheat from the chaff (both made of cellulouse by the way).
I don't doubt that it would be possible to destroy a planet by filling it's atmosphere with CO2.
But it might also be possible to make it more livable. If not, then removing the CO2 should be nearly as easy to do as it was to put it into the atmosphere in the 1st place.
It really isn't rocket science to make "pure carbon" and then get rid of it or at lease Sequester it if that is what we must do to survive.
The solutions to our problems are out there if we look close enough.