Status von drak (drak) auf Tuesday, 28-May-13 08:29:02 UTC
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The optical depth of the stratospheric aerosol layer between 20 and 30 km has increased 4–10% per year since 2000 → http://onlinelibrary.wiley.com/doi/10.1002/grl.50263/abstract
Tuesday, 28-May-13 08:29:02 UTC von web