paleo<br /><br />The possibility remains of such an event, however slight. And, I feel quite confident that, in the history of the universe, there will be at least one species that will assume as you do, that will take the chance, and be wrong.<br /><br />However, more importantly, never before in the Earth's history has there been a species that has so much potential to bring about its own extinction; intentionally, or not.<br /><br />As I have said elsewhere; this could be some religious fanatic who thinks that his action will clean the planet of infidels and leave the world for God's chosen people.<br /><br />Or, perhaps, somebody who has gotten it into his head that the world will be better off without humans; that we are an infestation on the universe to be wiped out.<br /><br />Or, it could simply be ignorance -- some action we are taking that has dire consequences that we either fail to see or refuse to see.<br /><br />One of the things that I have learned from events this last week is the human potential to sit in a situation where they face the most dire risks and do nothing about them -- taunting the fates.<br /><br />Doing nothing because, for the present, it is not convenient.<br /><br />I no longer trust my fellow humans to see to their own welfare. I think that it is best to scatter the human race into several, smaller, independent groups, so that the folly of one group will not bring the whole human race to an end.<br /><br />In addition, New Orleans, as well as the Indian Ocean Basin, were made substantially better off by the fact that there were others who were not directly impacted by the disaster. As the human race spreads out, any specific disaster becomes that much easier to handle. One that strikes the whole earth, even if it leaves survivors, is better handled if a large spacefaring civilization can provide emergency assistance.<br /><br />There are many more dangers in this universe than those you have accounted for, paleo. Probably more than I have accounted fo