I recently read that a Norwegian online grocer had accounted for a drop in the demand for a number of “carbon-intensive” products sold in the online store since introducing receipts that tell consumers how environmentally friendly [or not] their shopping basket was at checkout. Indeed, the reports stated that orders for less sustainable goods had fallen because customers are aware of their high carbon footprint thanks to the receipts. Which prompted me to write the following article.  Behavioural economics (the…