Smoke-choked Sydney ushered in the New Year with a huge fireworks display while police in Hong Kong fired tear gas at protesters, as crisis clouded some of the first celebrations to ring in the new decade.
Billions around the world are set to cheer in 2020 after a tumultuous year dominated by demonstrations calling for political upheaval and action on climate change.
Australia’s largest city usually puts on a dazzling display of pyrotechnics over the glittering harbour to kick off global festivities, but this year’s celebrations were overshadowed by calls to cancel the fireworks as devastating bushfires raged across the country
