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Communications of the ACM

ACM Opinion

Little Green Men Might Not Be So 'green'

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Orion Nebula

SETI has traditionally focused on looking for signs of life by scanning the skies for electromagnetic radiation. Above, a false-color view constructed using infrared data from the Spitzer Space Telescope of the Orion Nebula.

Credit: NASA/Reuters

Humans are affecting the Earth’s systems on a global scale. Industrial pollutants are accumulating in our atmosphere with the potential for long-term impact on global climate and biodiversity.

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