And die.
The only thing that does not release CO2 is something that has been dead so long it is not decaying any longer.
We are an essential part of the planetary cycle.
Do away with all the things that give off CO2 and you have a dead world.
I used to think "The Order of Null" was a fantastical reach because sentient beings could not be that stupid. I was wrong.
I am thinking that their “science” is whole-cloth lying.
The atmosphere of Mars is primarily CO2. I bet that the Earth’s once was, too. CO2 is probably the greatest transporter of Carbon in life on Earth.
The reign of plants has changed Earth’s atmosphere forever. Yet, earth life needs CO2, as its animals need Oxygen.
These grifters are the same scoundrels that you see roll into town every few weeks in the old “Rifleman” series. They have a wagon full of elixirs to sell, or lightning rods that never get delivered. It is the time-honored human condition of the shuck-and-jive, always trying to talk someone else out of their money.