Well, if you plan to have humans to feed, turning the planet into a literal greenhouse - the entire reason they are called "greenhouse gasses" - isn't exactly beneficial to those humans. They don't do well in high heat, high CO2 environments.

CO2 traps heat. Less than methane, but for a longer period of time. If you wanna make a super carbonated environment indoors in a real glass greenhouse... By all means. Doing that to the planet is a very, very bad idea for humanity. For many reasons.

Unless you like the idea of acidic, overflowing seas and a return to the paleolithic environment.