| "A valuable service ... [and the] leader in its space." | -- Boston Globe |
| "Good idea!" | -- CNN |
| "CO2Stats trust marks on sites ... allow businesses and visitors
to engage in web commerce with less concern about climate
change. The more the internet and its climate impact grow,
the greater the need for approaches like CO2Stats." | -- Fast Company |
| "A really cool tool." | -- VentureBeat |
| "CO2Stats ... has taken off." | -- Telegraph |
| "Get CO2Stats ... [It] highlights the fact that Internet
surfing does come at a cost to the environment." | -- Los Angeles Times |
| "CO2Stats [shows] a competent yet passionate desire to
solve a world-wide problem using the power of the Web." | -- The Industry Standard |
| "The [CO2Stats] methodology for calculating
energy consumption is extremely rigorous." | -- TechCrunch |
| "Impressive." | -- Earth2Tech |
| "Very interesting and useful." | -- Mashable |