Australian fire seasons have been steadily worsening over the last several decades primarily as a result of unprecedented drought conditions with extremely hot and dry weather. Unlike the Brazilian Amazon fires, most Australian bush fires are started by the natural cause of dry lightning, though humans have exacerbated fire extent and intensity through climate change. Fires are also becoming increasingly damaging due to continued expansion of settlements at the urban-wildland interface.
The following verified resources can provide additional context for the causes and results of the Australian Fire crisis, through both science and news stories.
UN Environment: "Ten Impacts of the Australian Bushfires"
United Nations Foundation: "What the Australian Bushfires Tell Us about Health and Climate Change"