It is important to make a distinction between the emissions trading scheme, a pure emissions trading scheme, and a carbon tax. An emissions trading scheme sets the amount of carbon that can be released and lets the market decide the price; whereas, a simple carbon tax just sets the price and doesn't worry about how many emissions we're emitting. Now, it's really important to make this distinction, because over time with this Government, while we've been tinkering around, we've been moving closer and closer from a pure ETS to a carbon tax. With the setting of a price floor, a price ceiling, and now a secret reserve at auction, we are moving further and further away from this pure emissions trading scheme, where the price is left to the market, and closer and closer to a tax—which, let's face it, is what the Greens and Labour actually always wanted. So they can't help themselves at every possible moment to tinker with the ETS to make it look more and more like a tax. The reason that is significant is because there is a long-established principle that goes all the way back to the Bill of Rights Act, that this Parliament has the power to tax—not the Government and not the climate change Minister.