Bushfires flared in southern Australia on Thursday as a heatwave expected to bring renewed misery set in, and officials warned some areas are "just at the beginning" of the devastating crisis.

Soldiers went door-to-door advising residents to leave the South Australian town of Parndana on Kangaroo Island after a large blaze bore down on the area, with temperatures there soaring to 38 degrees Celsius (100 degrees Fahrenheit).

In neighbouring Victoria state, officials extended a "state of disaster" declaration for a further 48 hours ahead of scorching temperatures that were due to set in Friday, further stoking massive fires.

"It's a very dangerous and dynamic situation that will confront us over the next 12, 24 and 36 hours," Victoria Emergency Management commissioner Andrew Crisp said.

The catastrophic bushfires have killed at least 26 people, destroyed more than 2,000 homes and scorched some eight million hectares (80,000 square kilometres) -- an area the size of the island of Ireland.

Scientists say the drought-fuelled blazes are being worsened by climate change, which is increasing the length and intensity of Australia's fire season.

Victoria Premier Daniel Andrews warned residents to brace for further devastation in what has already been a months-long crisis.

"We're just at the beginning of what will be a really, really challenging summer," he said.

-- 'Extreme' danger --

Despite cooler weather and rainfall providing some relief in some bushfire-affected areas this week, almost 150 fires were still burning in worst-hit New South Wales (NSW) and Victoria, the vast continent's most populated regions.

Vast tracts of the states are facing "severe" fire danger Friday, with some areas in Victoria expected to experience "extreme" conditions.

"Don't get complacent with the rain that we've seen," Victoria police minister Lisa Neville said.

"These fires are absolutely still moving, still growing in our landscape and they pose significant risk to communities."

However in some burnt-out areas people have turned to the painful task of rebuilding their homes and lives, with the process expected to take years.

NSW announced Thursday it would spend Aus$1.2 billion (US$680 million) on restoring infrastructure in fire-ravaged areas. That comes on top of a separate Aus$2 billion ($1.4 billion) national recovery fund earmarked to help devastated communities.

"We are always standing shoulder-to-shoulder with those who have been impacted by the devastating fires, this catastrophe which has come to New South Wales and we are stepping up to make sure we provide that support," NSW Premier Gladys Berejiklian said.

The bushfire toll has not been limited to human losses -- the blazes have also wreaked wide-ranging environmental damage.

University of Sydney scientists estimate one billion animals have been killed in the fires. The figure includes mammals, birds and reptiles, but not frogs, insects or invertebrates.

Bushfire smoke has shrouded Australia's major cities in toxic haze for weeks, causing major public health concerns.

The smoke has also travelled more than 12,000 kilometres (7,400 miles) to Brazil and Argentina, according to weather authorities there.

Australia experienced its driest and hottest year on record in 2019, with its highest average maximum temperature of 41.9 degrees Celsius (107.4 degrees Fahrenheit) recorded in mid-December.

Related Links
Forest and Wild Fires - News, Science and Technology

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Kangaroo Island shows burn scars on one third of the land mass
Greenbelt MD (SPX) Jan 08, 2020
NASA's Terra satellite provided before and after imagery that showed the extent of the fires that have been ravaging Australia's Kangaroo Island. Kangaroo Island lies off the mainland of South Australia, southwest of Adelaide. About a third of the island is made up of protected nature reserves which are home to native wildlife which includes sea lions, koalas and diverse and endangered bird species, including glossy black-cockatoos which have been brought back from the brink of extinction over the last ... read more