Who would have imagined carbon to become a priced commodity that can be traded one day? The Kyoto Protocol of 1997 envisaged exactly that when leaders from 38 industrialised nations came together and agreed to follow a system of carbon trading, pledging to bring down their emissions by an average of 5 per cent below the 1990 levels. The seminal environmental treaty put a cap on emissions and decided that the countries that wanted to emit more needed to buy carbon credits from countries that emitted less. That is how the carbon market came into being, a place where carbon credits began to be purchased and sold.