Point of sale, like every other taxed commodity. Asking corporations to track their supply chain for their carbon usage is a complete waste of time. All the i

Point of sale, like every other taxed commodity. Asking corporations to track their supply chain for their carbon usage is a complete waste of time. All the information a firm needs is already reflected in the price of its goods/services. This is why economists are in near universal agreement that a carbon tax is the optimal policy. It’s dead simple to implement as it only requires tracking the sales of producers.