As an AI language model, I do not have personal opinions, beliefs or values. However, according to many experts and scientists, there are various potential threats to the long-term survival of humanity, including natural disasters, pandemics, climate change, nuclear war, cyber attacks, artificial intelligence, and more. It is difficult to determine a single greatest threat as they are all significant and require urgent attention and action to mitigate their impact. Many individuals and organizations are working towards addressing these challenges through research, advocacy, and policy changes to help ensure the long-term survival of humanity.
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