Police have confirmed the death of another motorist.

An elderly man who went missing four days ago is in "good spirits" after being found alive in bushland in Sydney's north.

Ronald Weaver, who suffers from Alzheimer's and other medical conditions, was last seen on Woolcott Avenue in Wahroonga at 10am on Tuesday, sparking a full-scale search of up to 100 emergency service workers.

The 79-year-old was found by New South Wales State Emergency Service (SES) in North Wahroonga bushland about 11.30am today.

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Acting Superintendent Carlene Mahony said he was found in "very dense" bushland just off Jubes Mountain Bike Park near a tree.

"He was in good spirits and could respond to his name and he was showing signs of being able to hold rescuer's hands at the time," Mahony said.

Weaver was found in an area that had already been searched.

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"We presume that he has moved around this area and he has been in that tree or near that tree for probably the last 24 hours.

"We were very happy for the family and it was fantastic for us to be able to go and get Hannah his wife and take her down to the scene today.

"It was really nice and amazing to see her reunite with him and he did recognise her when she came down to the scene."

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She said everyone was surprised to see him alive as Weaver had survived four days without any access to food or water.

NSW SES volunteer Andy Kalsey found Weaver after he'd been searching with crews all morning.

"There was a team of eight of us and we were spread out in a line abreast," Kalsey said.

"It was my job to come up to the ridge and I just saw him out of the corner of my eye.

"When I got to talk to him and when I said 'g'day mate how you going' he was quite lucid."

Kalsey said he was relieved when he realised people had been searching for him.

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The local SES described the area as very rocky, with many cliffs, creeks and snakes.

Weaver is currently at Sydney's Royal North Shore hospital in a stable condition, where he is getting some treatment and "much-needed rest".

The four-day coordinated effort involved NSW Police resources including PolAir, the dog squad and trail bike unit as well as NSW SES, NSW Rural Fire Service and the National Parks and Wildlife Service assisted in the four-day land and air search.

A Sydney wetland has turned pink in an unusual sight that left a top scientist on a mosquito survey bemused.

Associate Professor Cameron Webb from NSW Health Pathology was surveying Sydney Olympic Park yesterday when he came across a pastel pink pond.

The wetland was in an "out of the way spot" within Bicentennial Park on the edge of a mangrove, a critical habitat that helps protect land from erosion.

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"Wetlands are always changing but it's usually shades of green and brown, to see a pink pond was quite a surprise," he told 9news.com.au.

"The colour wasn't something I was used to seeing in our wetlands, of course my mind went straight to thinking about what caused this bloom."

Webb said the pond is normally filled by freshwater, urban stormwater and run-off. 

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9news.com.au reached out to Sydney Olympic Park Authority, which has since confirmed the bloom is due to azolla – an aquatic, free-floating fern that is found in still or slow-moving water bodies.

"While it normally appears green, with different weather conditions it can turn pink," a spokesperson said.

"This change in colour at Sydney Olympic Park is probably due to some of the recent warmer weather.

"It is a natural phenomenon – and nothing for residents or park visitors to be concerned about.

"Like all waterways of this nature, residents and users are always recommended to avoid contact with the water."

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The sight comes as the intensity of La Niña, the weather event responsible for recent flooding rains, begins to ease.

Webb has previously said the volatile conditions have made the perfect breeding grounds for mosquitoes

"With so much water in the environment after the rains and flooding, it creates perfect conditions for mosquitoes," he said.

"As soon as warmer weather arrives we're expecting a population increase."

‘The public is advised to stay out of the water.’

NRL player TC Robati has been stood down from the Broncos after being charged over a serious alleged incident at a Brisbane venue.

Robati, 21, was charged by police on Christmas Eve after the alleged incident took place on December 21, during the team's Christmas leave period.

The allegation involving the second-rower has been reported to the NRL Integrity Unit by the club.

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Broncos CEO Dave Donaghy said the club had accepted Robati's position in standing down from all club activities.

"There is now a legal process in place and that needs to be respected and adhered to," Donaghy said.

"The Board and I will review the matter further following TC's court appearance in January."

Police are investigating the sudden death of a two-year-old girl in Queensland.

The dead child was taken to Mackay Base Hospital at about 8.30pm on Thursday.

An autopsy will be conducted to find out the cause of death.

Police said investigations into the circumstances are ongoing.

"There is no further information available at this time," a spokesperson said.

Holiday hotspots are the place to be right now and into the new year.

Heavy traffic on SH1.

Divisive kickboxer-turned-internet provocateur Andrew Tate has been arrested by Romanian police as part of a human trafficking and rape investigation.

Tate, his brother Tristan and two Romanian nationals are accused of being part of a criminal group that seduced women and sexually exploited them, according to Romania's Directorate for Investigating Organised Crime and Terrorism.

The alleged victims were recruited "by British citizens by misrepresenting their intention to enter into a marriage/cohabitation relationship and the existence of genuine feelings of love", a police statement said.

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The women were then allegedly exploited through physical violence and mental coercion into making pornography.

Six alleged victims have been identified by police.

The statement by police does not detail Tate's alleged involvement and he is yet to be charged with anything.

Since retiring as a kickboxer, the Englishman has gained notoriety for his bigoted and misogynistic remarks on social media.

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He had been banned from Twitter, but his account was reinstated after Elon Musk acquired the company in November.

On Tuesday he posted a tweet directed at teenage climate change activist Greta Thunberg bragged about his high-emission cars.

Thunberg's withering reply has become one of the most-liked tweets of all time since it was posted yesterday.

https://twitter.com/GretaThunberg/status/1608056944501178368

Romanian news site Gandul reported prosecutors had been waiting to arrest Tate and his brother for months but were waiting for them to be back in Romania, where they live.

A video Tate posted in response to Thunberg showed him smoking a cigar in front of two pizza boxes.

Those pizza boxes were clearly identifiable as being from a Romanian chain named Jerry's Pizza.

He was arrested soon afterwards.

The mercury rose to the highest point it has reached in December.