Australia has welcomed a new decade amid one of its worst-ever bushfire seasons.
The call-outs followed a controversial Sydney New Year's Eve fireworks display which went off without a hitch despite elevated fire risk.
Thousands of partygoers arrived in Sydney early on Tuesday to secure a good spot to view the $6.5 million fireworks display.
Australia's largest city usually puts on a dazzling display of pyrotechnics over the glittering harbor, but this year's celebrations have been overshadowed by calls to cancel the fireworks as devastating bushfires rage across the country.
In South Korea, fireworks also exploded over the beach, as people gathered to watch.
Nearly $1 million was raised for communities battling bushfires and drought.
A number of other firework displays across the country were cancelled but Sydney's Lord Mayor defended the city's plan to press ahead with the display.
More than 100,000 fireworks lit up the skyline for the hundreds of thousands of spectators thronging the city center.
Fireworks erupt over the Melbourne central business district.
After more than six months of near-daily demonstrations, Hong Kong ushered in 2019 with a series of pro-democracy rallies planned for New Year's Eve.
The start to 2020 came after a day where fires ravaged parts of Victoria and NSW, which left two more dead and five people missing.
Russian Federation will celebrate the new decade over several time zones, with Muscovites flocking to the centre of the capital for fireworks over the Kremlin.
"The wonderful Aussie spirit that means we always overcome whatever challenges that we face that we always look optimistically into our future", he said.
"There's no better place to raise kids anywhere on the planet".
But the message drew criticism on social media.