Slight note, that's proportional to the fourth power of the -absolute- temperature, so the ideal radiation between two 0 Celcius and 37 Celcius (32F to 98F) is really between 273 Kelvin and 310 Kelvin, each raised to the 4th! It turns out to be 219 watts, or about half of our normal output of 550 watts.

During a summer day, it's not much of a problem. But as soon as temperatures start plummeting or the night sky is clear above you (absolute zero in space), radiative heat loss starts up.