Authorities in Australia declared a state of disaster on Saturday after bushfires destroyed houses and razed vast belts of forest in the country’s southeast. Temperatures soared past 40 degrees Celsius (104 degrees Fahrenheit) as a heatwave blanketed the state of Victoria this week, with hot winds fanning some of the most dangerous fire weather since the “Black Summer” bushfires of 2019 to 2020. One of the most destructive bushfires ripped through almost 150,000 hectares (370,000 acres) near...