We don't even worry about it because another nuke doesn't make that much difference in a nuclear winter.
Madness string 10926
Three thousand kilometers, 20 meters, 11 decimeters, 4 centimeters, 25 millimeters, 72 micrometers, 59 nanometers, 2 picometers, 42 femptometers, 0.17 attometers, 97 zeptometers, and 1 yoctometer.