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| web | Linnea Harris | EcoWatch | 2022-11-05 |
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| web | Blake Hurst | The American | 2009-07-30 |
| web | Paul Reynolds | BBC News Magazine | 2009-06-27 |
| web | Kate Murphy | New York Times | 2009-05-13 |
| web | Steven Kurutz | New York Times | 2008-03-13 |
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| web | Harry Wallop | The Telegraph | 2008-06-26 |
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| web | Abby Wilson | Better Homes and Gardens | 2023-09-11 |
| web | Brian K. Sullivan, Elizabeth C... | Bloomberg | 2014-01-16 |
| web | Matthew Green | San Francisco Chronicle | 2008-03-29 |
| web | Matthew J. Mariola, Ohio State... | Ohio State University | 2007-10-14 |