A firefighter conducts back-burning measures to secure residential areas from encroaching bushfires in the Central Coast, some 90-110 kilometres north of Sydney on December 10, 2019. Toxic haze blanketed Sydney on December 10 triggering a chorus of smoke alarms to ring across the city, as Australians braced for "severe" weather conditions expected to fuel deadly bush blazes. (Photo by Saeed Khan/AFP Photo)
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