Co2pid

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.