> I imagine most people (in the West) [...] buy food based on price and appeal rather than climate impact. I'm not into smartphones since my 12-13 year old pho

> I imagine most people (in the West) [...] buy food based on price and appeal rather than climate impact. I'm not into smartphones since my 12-13 year old phone still kind of works (lost battery cover so battery often disconnects, often bad contact with sim card...), but I know from behavior of some friends that there are apps which track foods and products by barcode for calorie intake etc..., in theory an app could by barcode pop up a warning or something pointing out the environmental impact of a product which relies on environmentally harmful soy, palm oil, ... it should list both impact of full consumption, and impact by "dose" or rate if it's say shampoo. After using it for a while it could say calculate the impact of your choice of shampoo by looking at the first and last dates of buying a bottle and the total number of bottles minus one divided by the time between first and last... then the user could see a breakdown with sometimes perhaps counterintuitive results. Users should be able to collaborate in verifying and correcting calculations, so only a minority need spend time and effort such that a majority can rely on the app more blindly... Edit: adding that it's also not helping when geopolitical rifts induce my country to ... burn produced apples and pears, instead of letting their price fall for a year...