Nature: Australian firefighters are desperately trying to extinguish the worst bushfires that the country has seen in decades, causing more than 170 deaths so far in the state of Victoria. While strong winds continue to fan the flames, thousands of homeless families in search of shelter and food are flooding Red Cross relief centres set up around the state. Nature asks if savage blazes such as these will get more frequent in a warming world, and looks at the environmental fallout from the …