I doubt you have a clue about what you are talking about. But giving you the benefit of the doubt I should note that every planet emits more heat than it receives from the Sun. In the case of the rocky planets, radioactive decay of certain elements accounts for the energy difference, and for the gas and ice giants, their continuing compression accounts for the heat.
This does not mean that CO2 in the atmosphere can't explain the atmosphere. Only someone who doesn't know anything about planetary science or even basic thermodynamics would say that.
This does not mean that CO2 in the atmosphere can't explain the atmospheric temperature.
For years, planetary science held that the surface temperature of Venus would be only slightly hotter than the Earth... cool enough that liquid water would exist. But that prediction was blown out of the water by our actual space probe visits to Venus. Instead of "slightly hotter" they found a world with a surface temperature of about 450º Celsius (723 Kelvin), hot enough to keep lead and tin in a molten state.
According to raw data Venus is massively out of thermal balance. Moreover Sagan’s “super greenhouse theory” to explain the heat is not workable. Descender probes have reported pitch blackness in the middle cloud layer and light at the surface which thus has to be local, created by chemical reactions and heat. Sagan’s greenhouse requires that sunlight reach the surface and it clearly doesn’t.