EcoCart raises $3 million for a Honey-like browser extension to offset shoppers’ carbon emissions EcoCart, a company pitching consumers on ways to offset their carbon emissions for free at select merchants (with a browser extension!) has raised $3 million in financing from Base10 Partners. Brands pay the company a commission to drive traffic to their websites under a standard affiliate marketing model and EcoCart uses a portion of the proceeds to offset a shopper’s carbon emissions. About 10,000 companies work with EcoCart, either through direct partnerships or passive affiliate marketing services. EcoCart also offers a carbon accounting tool for businesses and an offsetting offering for them as well, according to co-founders Peter Twomey and Dane Baker.