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You can supply heat enough to break the inter-molecular bonds. C atoms are at gas phase. Remember that temperature is not everything, you can still keep temperature unchanged while let the reaction happens by playing with pressure.
Pressure and temp both play a role on how a substance would behave. CO2 can go through sublimation because it was given the conditions, like 1 atm and room temp. I think it would go through the "normal" solid, liquid, gas phase changes if the pressure were higher. It's like how water could also boil (liquid to gas) if the pressure is lowered.
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