In what promises to be a hotly debated theory, an international team has propsed that a greenhouse gas once save the world. When Earth was just cooling down from its fiery creation, the "young sun was approximately 30 percent weaker than it is now, and the only way to prevent earth from turning into a massive snowball was a healthy helping of greenhouse gas," Associate Professor Matthew S. Johnson of the University of Copenhagen Department of Chemistry explains. And he has found the most likely candidate for an archean atmospheric blanket: carbonyl sulphide, a product of the sulphur disgorged during eons of volcanic activity.

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