User blog comment:Glflegolas/Human Extinction -- are we approaching the Doomsday?/@comment-25101089-20150308231139/@comment-26116279-20150308232842

i voted 4000 ad or later as well, virtually all mass extinctions in Earth's history have been due to extraterrestrial calamaties that we can't control, and they usually happen every 100 million years or so. so we have time.