Scientist stuns experts by saying trees worsen greenhouse effect: "Hamburg- A leading expert in Germany has spawned a major scientific debate by claiming that trees put millions of tons of methane into the atmosphere every year exacerbating the greenhouse effect. Amid controversy, Dr Frank Keppler of the Max Planck Institute for Chemistry has reaffirmed findings by his team in Mainz, Germany, in January 2006 that they had detected methane exhaled from living
plants. "
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