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The sustainability of an area depends entirely on how we manage the precipitation, the time of year it falls and the quantity of rain. Each land manager has many different grass communities unique to his particular area. While graziers are improving the land on which they run their stock, they are also upgrading their herds. Landcare has proved to be a resounding success for Australia. Sometimes it seems that some pastoralists manage their rain quota better than others. There are so many variables to sustainability - each one different, due entirely to a particular situation that may or may not repeat itself in the future.