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Mancer is a portmanteau of the words "man" and "cancer" used to describe the negative impact of mankind, particularly on the planetary environment. According to Gaia theory, first formulated by scientist John Lovelock, the Earth is a superorganism. Under this hypothesis, since Homo sapiens is the only species in the history of life on Earth to have negatively impacted the planet's ecosystems and non-human species, humans can be seen as a "cancer" of Gaia.
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