Once you get your hands on NZ Units, you call sell them – possibly for a profit, if the carbon price rises. That’s why finance traders will be placing bids today. They’ll be competing with the carbon-creating companies, who need to turn over one NZ Unit for every tonne of carbon dioxide they release each year. They’ve needed to hand over units since 2010, but until this year they could buy an unlimited number from the Government at a set price. If you purchase NZ Units today, it’ll pay to hang on to them until at least May 2021, as that’s the deadline for the emissions that co...