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"You should stop skylarking about with those bloody desert mice and try and stop those woody weeds. I could see clear through that paddock in the '60s. Now look at it. That scrub costs us tens of thousands of dollars in lost fodder and it's almost impossible to muster the livestock." That blunt assessment of our research, first offered by a local farmer in Australia's arid rangelands almost seven years ago, raised an irresistible question for us as field ecologists. Why are Australia's (and many others around the world) grasslands becoming woodier?