How is the boiling point of carbon dioxide lower than its melting

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>>9162460
The boiling point isn't lower than the melting point, neither of those exist at STP because liquid co2 doesn't exist at STP. However at higher pressures and temps it does

Is it not true though that, if one were to decrease the temperature or increase the pressure of gaseous carbon dioxide, it would reach of solid state before a liquid state?

>>9162746
Depending on your starting temperature and pressure, it could be a yes or a no. You just described the reverse of sublimation, which is entirely possible. Look up how to read a phase diagram then look at the one I posted earlier. For your purposes you can ignore the supercritical fluid phase