| "A valuable service ... [and the] leader in its space." | |  |
| "Good idea!" | |  |
"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." | |  |
| "A really cool tool." | |  |
| "CO2Stats ... has taken off." | |  |
"Get CO2Stats ... [It] highlights the fact that Internet surfing does come at a cost to the environment." | |  |
"CO2Stats [shows] a competent yet passionate desire to solve a world-wide problem using the power of the Web." | |  |
"The [CO2Stats] methodology for calculating energy consumption is extremely rigorous." | |  |
| "Impressive." | |  |
| "Very interesting and useful." | |  |