…Australia’s hellish fire season has eased, but its people are facing more than a single crisis. With floods destroying homes not far from where infernos recently raged, they are confronting a cycle of what scientists call “compound extremes”: one climate disaster intensifying the next. …One result of that multiplier effect for Australia — a global bellwether for climate change’s effects — is that rebuilding after a disaster becomes far more complicated. Many Australians in disaster zones complain that their government, after dismissing climate change for years, has yet to outline recovery plans that are clear and that take future threats into account. At the same time, the economic costs of a changing climate are skyrocketing. Philip Lowe, the governor of the Reserve Bank of Australia, warned recently that Australia was already paying a price, and that it would only go up.