There are concerns that merit serious consideration. Many people worry about overpopulation and the water and food shortages it may bring. Others fret about the consequences of a global financial collapse. What about natural disasters, epidemics, or nuclear war? Could such events bring about a global catastrophe? Consider briefly some commonly discussed doomsday scenarios. Not all threaten to kill everyone on earth, but they certainly appear to have the potential to bring doom to civilization as we know it. They include the following.
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