Australia bushfires north of Sydney 'too big to put out' (1/6)

A fire blazes across bush in Newnes Plateau, New South Walles, Australia, December 7, 2019 in this picture grab obtained from a social media video on December 8, 2019. (Photo/Agencies)

People watch as smoke from the Green Wattle Creek fire is seen from Echo Point lookout in Katoomba, as bushfires continue to blaze in New South Wales, Australia, December 6, 2019. (Photo/Agencies)

Beachgoers are seen on Milk Beach as smoke haze from bushfires in New South Wales blankets the CBD in Sydney, Australia December 7, 2019. (Photo/Agencies)

A NSW Rural Firefighter establishes a backburn during bushfires in Mangrove Mountain, New South Wales, Australia, December 8, 2019.(Photo/Agencies)

A NSW Rural Firefighter establishes a backburn during bushfires in Mangrove Mountain, New South Wales, Australia, December 8, 2019. (Photo/Agencies)

A fire blazes across bush in Newnes Plateau, New South Walles, Australia, December 7, 2019 in this picture grab obtained from a social media video on December 8, 2019.(Photo/Agencies)