Massive infernos have raged along the nation's east coast for months, pushing smoke across the Pacific. Nasa said plumes from blazes around New Year's Day had crossed South America, turning skies there hazy, and moved "halfway around Earth" by 8 January. "The smoke is expected to make at least one full circuit around the globe," the US space agency said. Hundreds of bushfires have burnt across Australia, killing at least 28 people and destroying more than 2,000 homes.
