Planetary Scale Disasters can have non-human sources. To date their have been no such disasters with human sources. Their HAVE been multiple disasters on that scale. Typically they have involved super volcanoes or asteroid impacts. All of them have low probability in any given year. The mean...
It will take a long time to get to a Planet B situation. The figure of 100 years is hardly long term thinking. Cleaning up our own planet is very important but that is also short term thinking. Some planet scale disasters can only be survived by being somewhere else when they happen. We have...
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