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| web | Hiroko Tabuchi | New York Times | 2017-01-12 |
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| web | Maxine Joselow | E&E News | 2020-10-26 |
| web | Kevin Vaughan | Rocky Mountain News | 2008-05-12 |
| web | Sarah Karush | Associated Press | 2006-08-19 |
| web | Sholnn Freeman and Amy Joyce | Washington Post | 2006-01-24 |
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| web | David R. Baker | San Francisco Chronicle | 2018-05-22 |
| web | Cleve R. Wootson Jr | Washington Post | 2018-03-31 |
| web | Tom Randall | Bloomberg | 2015-05-06 |
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| web | Talib Visram | FastCompany | 2022-11-18 |
| web | Jillian Ambrose | The Guardian | 2021-11-03 |
| web | Tiffany Hsu | New York Times | 2019-10-29 |
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| web | Robert Collier | San Francisco Chronicle | 2006-04-24 |
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