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By Nina Chestney LONDON (Reuters) - A new molecule has been detected in Earth's atmosphere which could help produce a cooling effect, scientists said, but it remains to be seen whether it can play a major role in tackling global warming . The molecule can convert pollutants, such as nitrogen dioxide and sulphur dioxide, into compounds which can lead to cloud formation, helping to shield the earth from the sun, the researchers said. Over the past century, Earth's average temperature has risen by 0.8 degrees Celsius.
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