Carbon dioxide has become synonymous with the environmental friendliness of car transport. In recent years, however, CO₂ has only been given a negative label. At the same time, it is a non-toxic, inert, colourless, tasteless and odourless gas. CO₂ is a normal part of our lives. It is formed by the reaction of carbon with oxygen, for example in a process called combustion, but also in ordinary human breathing … what do you know about it?