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Methane on Mars is produced and destroyed far faster than on Earth, according to analysis of recent data. Scientists in Paris used a computer climate model for the Red Planet to simulate observations made from Earth. It shows the gas is unevenly distributed in the Martian atmosphere and changes with the seasons. The presence of methane on Mars is intriguing because its origin could either be life or geological activity, including volcanism. Writing in the journal Nature, Franck Lefevre and Francois Forget from the Universite Pierre et Marie Curie in Paris describe how they used a computer model of the Martian climate to replicate observations made by a US team.