Just to follow up, it's interesting that we're talking about water. One of the previous witnesses just reminded us that, although we value oil and gas, water is perhaps more valuable than that. You mentioned the Murray-Darling system and the troubles it's having.
I'm just wondering how the aboriginal people in South Australia or Victoria or wherever assert their rights over parts of a river when you have a linear system like that. You are growing cotton, but the headwaters and all that water is being used up, and you have nothing left by the time it gets to the sea. How are those rights dealt with in Australia?