Yes, but what percentage of human life on earth is under 2 meters or more of soil? Human life on mars is likely to be underground to avoid the extreme cold, va

Yes, but what percentage of human life on earth is under 2 meters or more of soil? Human life on mars is likely to be underground to avoid the extreme cold, vacuum, and radiation. So I could see a GRB taking out a hugely larger fraction of life on earth (with no warning) than mars (assuming a colony there).