2008 12月 9, Jeff Jacoby, 「Skepticism on climate change [對氣候變化的懷疑]」, 出自 The International Herald Tribune[1], →ISSN:
There were dozens of presentations in 2008, including: […] "The Overstated Role of Carbon Dioxide on Climate Change."
2008年有數十場演講，其中包括：[…]「二氧化碳對氣候變化的誇大性作用」。
2013 September–October, Katie L. Burke, 「In the News」, 出自 American Scientist[2]，於2013-09-03歸檔自原頁面:
Oxygen levels on Earth skyrocketed 2.4 billion years ago, when cyanobacteria evolved photosynthesis: the ability to convert water and carbon dioxide into carbohydrates and waste oxygen using solar energy.
