Why does carbon dioxide only exist in gas and solid state under STP/SATP conditions?

$\ce{CO2}$ pressurized to $\pu{5.1 atm}$ can exist in all 3 states: solid, gas, and liquid.

However, why couldn't the same happen in 1atm pressure? As a solid chunk of dry ice is the coldest you could get $\ce{CO2}$, why cant you warm it up slightly but still have it cold enough to turn into a liquid, instead of directly to a gas?

  • 3
    $\begingroup$ Because its pressure at triple point is higher then atmospheric. $\endgroup$ – Mithoron Dec 13 '17 at 1:20

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