Calls about ecology: 217 2008-02-09 Collapse Jerry, Pip, Bob Frankston Mary Hodder crisis ecology economics 213 2008-01-12 Investing in Sustainability Jerry, Pip, Sébastien Thévoux-Chabuel ecology economics 210 2008-12-15 Hydroponic Farming Jerry, Pip, Gene Giacomelli agriculture water health ecology 128 2007-03-26 Clean Energy (Innovations) Jerry, Pip, Andrew Beebe John Holdren Martin Roscheisen energy ecology 126 2007-03-12 Addressing the Climate Challenge Jerry, Pip, John Holdren ecology People interested in ecology:
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