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Making the hidden cost of food visible Short description (132 char limit): Reveals the hidden environmental cost of frozen foods in your Walmart cart using peer-reviewed climate science. Detailed description: CO2PID converts the carbon emissions, water usage, and land impact of every frozen food item in your Walmart cart into real dollar amounts — showing you what your groceries truly cost the planet. Built on peer-reviewed science from Poore & Nemecek 2018 (Science journal, 38,700 farms, 119 countries), CO2PID uses the EPA's Social Cost of Carbon ($185/ton), Water Footprint Network scarcity pricing, and TEEB ecosystem valuations to calculate hidden environmental costs. Features: Hidden cost badges injected directly into your Walmart cart page Letter grades (A-F) for every frozen food product Expandable breakdown showing carbon, water, and land costs Real-time quantity tracking — costs update when you click +/- TRUE COST display next to Walmart's Estimated Total 40 rotating science-backed sustainability tips Justice Score mapping 15 major food companies to ESG data Full transparent methodology page 57 frozen food archetypes with brand fallback detection 100% client-side — zero API calls, zero data collection, zero tracking Works on walmart.com/cart. Built with vanilla JavaScript, Chrome Manifest V3.