Bambi, facts don't exist in isolation. Sometimes you add several together. Average temps in Australia went up over a degree Celsius in one century. (usually, in interglacial periods, this takes thousands of years) Marine water temps also rose, with results of coral reef damage (again, not in a normal cycle). Greenhouse gases rapidly increasing, all specifically traceable (through spectrometer analysis and other reliable methods) to human sources. NOx from tailpipes, for example. (the x signifies two forms of nitrogen oxide) Species migration to new habitats. Again, over a very short period, due to unprecedented rates of change. Ice melting (the rate of melt is, again, part of a very solid body of evidence). Positive feedback effects - another fact that adds to your understanding of the science: when highly reflective ice vanishes, and is replaced with darker, more energy-absorbing land surface or open ocean, that area of earth is now accumulating heat energy that was formerly reflected back into space. So overall heat retention accelerates. This changes oceanic currents and drives hotter dryer weather in Australia.
So, when the rate of drought and resulting bush fires picks up, that's a fact that EXISTS IN RELATION TO OTHER ALREADY WELL ESTABLISHED FACTS ABOUT ABNORMAL RATES OF CLIMATIC CHANGE, NOT BY ITSELF. It's like a trial in court, where there are MULTIPLE LINES OF EVIDENCE.