It takes 12 tonnes of carbon and 32 tonnes of oxygen to produce 44 tonnes of CO2. To my senile brain $40 a tonne equates to a tax of $146.76, which suggests to me this is where that Christine Milne of The Greens, gets her amount of $120.00 (she is being generous) which she throws around when Gillard is not around. South of $40 is chicken feed if this is the case, and we can all look forward to many more little add ons over the time. Until the next election anyway.