"I pay tribute to his incredible service in land management and fire management over many years, and acknowledge the loss of the community and the feeling of grief today by many in the days to come, not only at this point in time".
Air quality was again expected to be poor in Sydney after the city was blanketed by a smoky haze on Sunday.
28 people have died so far, and more than 2200 homes have been destroyed.
University of Sydney scientists estimate one billion animals have been killed in the fires.
"The scientific evidence base shows that as the world warms due to human-induced climate change, we experience an increase in the frequency and severity of extreme weather events", the academy's president John Shine said in a statement.
The tragedy brings the death toll to at least 27 people in a crisis that has destroyed more than 2,000 homes and scorched an area larger than the USA state of in since September.
But in the interview, the PM defended his government's approach, which he said took into account the effect of climate change on the bushfires.
Hundreds of millions of animals have been killed and around 12 million acres of land are said to have burnt or be now burning.
It's so unusual that many states have declared an emergency, including New South Wales, which is where most people live.
More than 10 million hectares (25 million hectares) have been destroyed so far - which is larger than the American state of IN - while smoke from the fires has spread halfway around the world, making the sky IN Argentina and the Atlantic Ocean darker is going to be.
Bushfires in Australia have raged out of control for months, causing widespread devastation and resulting in the U.S. State Department issuing a travel advisory for the country.
More than 100 activists waving signs reading 'burning earth, ' 'Scott Morrison is a fire starter, ' and 'wake up and smell the smoke, ' required more action to stop the fires outside the Australian high commission in London. That comes on top of a separate Aus$2 billion ($1.4 billion) national recovery fund earmarked to help devastated communities.