 In 2007, Wissner-Gross founded the technology company CO2Stats, which measures the amount of carbon dioxide emitted by using a website.CO2Stats is based in Cambridge, Massachusetts, and received funding from the seed venture capital firm Y Combinator.The company attracted controversy when Wissner-Gross was reported to have claimed, which he has denied, that a single Google search emitted seven grams of CO2, which Google disputed.