A Swedish company has invented a new type of plant milk from potatoes, which is claimed to be the most environmentally friendly milk substitute. The production of this milk releases the least amount of carbon dioxide compared to other alternatives like oats and almonds. The product is currently available in the UK, but consumers have reported issues with lumpiness when using it in beverages like coffee and tea. The sustainability of other milk alternatives, particularly almond milk, is raising concerns due to the increasing demand and the limited arable land required for potato milk, which is less than that for oats.