yes, much denser. see my post above for explanation.
denser at point of creation but also the effect intensifies with time. its just simple chemistry
Please explain the mechanism by which carbon dioxide, in any form, causes atmosphereic warming or retention of heat. I have yet to read a comprehensive description of this.
It mystifies me that an odorless, colorless gas that constitutes a mere 0.04 % (approx.) of the earth's atmosphere has these magical properties.