CO₂.Earth's predecessor, CO₂Now.org, is featured in October 2010 edition of Sustainability: The Journal of Record.  The feature is part of a review of sustainability websites in the article, The Sustainability Web.   

Here is a featured excerpt from the article

"Under the theory that if more people see the numbers, they will recognize the urgency of the situation, the most up-to-date numbers dominate the home page."

Sustainability  Page 309 (Volume 3, Number 5)