Widespread discussion on the cause of our cyclical bushfires is occurring. (Letters, 10/1). The combination of sustained dryness, heat, wind (for supplying oxygen and ember carriage), fuel load and ignition are on the list. Politicians translate that to labels like “climate change, arson and failed back burning policy”. Rarely is it appreciated that the gum tree is a predator species, allowing few other species to grow nearby. Increasing the soil salt content and alkalinity selectively modifies the local environment to its advantage. It is excellent at taking up water after dry spells. The growth of the gum in harsh conditions further worsens the local environment. The oil content of the 200-foot gum tree is explosive during bushfires, increasing the fire intensity. Its underground root tuber sustains its early regrowth and proliferation. Replacing gum trees with high chlorophyll containing forests (eg Mediterranean Myrtle) should dramatically improve soil, humus, consumption of UV light and CO2, and impact favourably on microclimate. Leaving a three-kilometre gum tree free zone around all townships in Australia might be worth trialling. We are implored by the extraordinary cost in lives, time and assets to think outside the box as we undertake researching real solutions in this hour of national crisis. Alan Sexton, North Parramatta. 11Jan2020.