Amazon Fresh Carbon Cost is a Chrome extension that provides users with the ability to estimate the CO2 emissions of items available on the Amazon Fresh website. The extension conveniently displays the carbon emission estimate alongside the price of each item, with color coding to indicate high emissions. Users can also easily view the total carbon emissions of their cart when on the cart view page.

Moreover, the extension offers additional information on how to reduce grocery carbon emissions through the "Learn about your groceries carbon emissions" button. Amazon Fresh Carbon Cost aims to raise awareness about the environmental impact of purchasing decisions made on the Amazon Fresh platform.