In futures studies, human extinction is the hypothetical complete end of the human species. This may result either from natural causes or due to anthropogenic (human) causes, but the risks of extinction through natural disaster, such as a meteorite impact or large-scale volcanism, are generally considered to be comparatively low.
Many possible scenarios of anthropogenic extinction have been proposed, such as climate change, global nuclear annihilation, biological warfare and ecological collapse. Some scenarios center on emerging technologies, such as advanced artificial intelligence, biotechnology, or self-replicating nanobots. The probability of anthropogenic human extinction within the next hundred years is the topic of an active debate.
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