"William Ruddiman, a professor of environmental sciences at the University of Virginia, is behind a controversial theory suggesting that humans had a hand in warming the planet nearly 8,000 years ago, and in doing so, might have prevented another ice age."
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This is controversial, 8.000 years compared to 4 billions years? Is statistically insignificant any claim about this period. Perhaps the global warming is a recurrent phenomenon, and humans have nothing to do. Think about this: does dinosaurs impacts on the environment was greater or lower than human impact?
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