'It's unprecedented': What is behind Australia's devastating fires?

Australia continues to burn after more than a month of raging bushfires, and it doesn't appearthe smoke-filled skies will be clearing any time soon.

As of Friday, more than five million hectares haveburned, 19 people havedied and21people are missing.Tens of thousands of people wereforced to flee their homes. More than eight million more were under an emergency order.

While Australia is no stranger to bushfires, this one has captured the world's attention. Images of burnt-out cars, people fleeing homes, a parched koala desperately drinking from a cyclist's water bottle and angry townspeople screaming at Prime Minister Scott Morrison for more action are making global headlines.

And there's a good reason for the attention.

"In my experience of doing this fire monitoring, in some places you see intense fires over quite large areas maybe for a week or a few weeks, but to see them for four months in one particular place it is quite surprising," said Mark Parrington, a senior scientist at the European Centre for Medium-Range Weather Forecasts (ECMWF).

"We only have 17 years of[CO2emissions] data,"said Parrington, who works in the Copernicus Atmosphere Monitoring Service Development Section at ECMWF analyzing wildfire emissions,among other sources. "But in that context then, yeah, absolutely, it's unprecedented."

Australia has been experiencing warmer, drier conditions latelya resultin part to something called a Positive Indian Ocean Dipole,a phenomenon similar to El Nio.

As a result of westerly winds in the equatorial region weakening, warmwater from the deep oceanshifts towards Africafrom the Indian Oceanand cool water rises upin the east. For Australia, this temperature difference means drier and hotter weather for much of the continent.

Fingerprints of climate change

However, that's not the only factor. The country has been experiencing long-term drought conditions, even when there isn't a positive dipole. In Eastern Australia, which includes New South Wales, Queensland and Victoria where the fires are the worst, rainfall has been the lowest on record.

New South Wales alone has beenthe driest on record with rainfall 36 per cent below the 19611990 average, according to Australia's weather and climateagency.

The Murray-Darling Basin that stretches from Queensland southwest to South Australia, has experienced the driest 34 months on record, compared to other 34-month records starting in January. Victoria, where a state of disaster was declared, has also had its driest 34 months on record.

The fear is that the fingerprints of climate change are all over this.

Like the rest of the world, Australia is dealing with the consequences of a warming planet. Since 1910, the average temperature for the country has warmed by 1 C. Preliminary data from Australia'sBureau of Meteorology (BoM), suggests that in 2019 the annual temperature in thatcountrywas 1.52 C above average. (The official report is set to be released on Jan.9.)

If the data holds, it will blow out the record high set in 2013 when the annual temperature was 1.33 C above average.

"The duration, frequency and intensity of heat waves have increased across large parts of Australia since 1950," the Australian governmentreported. "There has been an increase in extreme fire weather, and a longer fire season, across large parts of Australia since the 1970s."

Renowned climatologist Michael Mann, a professor of atmospheric sciences at PennState University, wasin Australia during the fires. In a recent opinion piece in the Guardian, he described "smoke-filled valleys" and "brown haze."

"What is happening in Australia is a harbinger for other countries a taste of what our future will look like if we don't act now," Mann told CBC News.

Of particular concern to him is the planned Adani coal mine in Queensland (also known as the Carmichael mine) that would be one of the biggest in the world. And that mine could releasemore than 4.49gigatonnesannually of CO2 the leading contributor to the climate crisis. The carbon dioxide emissionswould be amongthe "highest in the world for any individual project," according to a 2011 joint report to the Land Court of Queensland.

Far-reaching consequences

Parrington recalls one of Australia's worst fires, known as Black Saturday, whichin 2009 killed 173 people in Victoria, injured 414 and killed more than a million animals, both wild and domesticated.

The human death toll pales in comparison thus far, but Parrington says the peak of the fires lasted just a few days.

"But the fact that this has been going on for several weeks, is really concerning, particularly as a lot of [fires] are occurring upwind of large population centres," he said.

It's particularly the scale of the current fires and number of people impacted, including those in New Zealand, where smoke from the fires has drifted, that concerns him. And that smoke can produce toxic chemicals like benzene and hydrogen cyanide, Parrington said.

Then there's the effecton glaciers.

The reflectivity of an object is referred to as the albedo. In the case of ice, its white surface reflects solar radiation, and it stays cool. But if theicedarkens for some reason say, if black soot falls on it thatwarms it up.

"Once it gets into the upper troposphere [lowest layer of Earth's atmosphere], it can get picked up by the jet stream there and be transported thousands more kilometres," Parrington said. "If there is transport to Antarctica any deposition of soot or black carbon to the ice would mean a change to the albedo and potential acceleration of the melting, local to where that deposition took place."

What the future holds is much worsein the absence of concerted action on climate.- Michael Mann, climatologist

Already, the Australian fires have changed the albedo on glaciers in New Zealand.

And the world's glaciers are already threatened with climate change.

So, is this a sign of things to come?

"What the future holds is much worsein the absence of concerted action on climate," Mann said.