Artificial Intelligence: His most frequent caveat, fearing an unaligned superintelligence could render humanity obsolete or extinct.
Population Collapse: Arguing that declining birth rates threaten civilization’s continuity.
The Great Filter: The hypothesis that explains why we see no other intelligent life—because civilizations inevitably hit a wall and destroy themselves.
The Ultimate Deadline: A direct, cosmic expiration date for all life on Earth, driven not by human folly, but by the inevitable laws of stellar evolution.
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