The company aims to build a plant at Mundra in the western Gujarat state which will convert 2 million tonnes of coal a year to PVC at a cost of US$4 billion. Adani wants to bring the project on stream within four years. Feedstock coal of about 3.1 million tonnes a year for the project will be mainly sourced from Australia and Russia. Indian critics argue that converting coal to plastic will require a high energy processing system that will also have a high carbon footprint. They say it would generate three times more carbon emissions than is generated from converting oil to plastics. They have slammed the proposal as an attempt to revive thermal coal when the world is shifting to green energy sources.