A driver is facing trial charged with killing a baby by placing him in his lap before they crashed in Sydney's south west.

Peter Wafta pleaded not guilty in the NSW District Court today to the manslaughter of the 11-month-old.

Crown Prosecutor Ken Gilson told the jury panel the car was involved in a low speed, almost head on collision with another vehicle after it attempted to turn right in February, 2019.

Witnesses are expected to tell the court they saw the baby with a distinctive bruise on his left cheek.

The Crown alleged his injuries were inconsistent with being restrained properly in a baby capsule and were instead caused by the steering wheel and airbag.

Mr Wafta is expected to argue the baby was in its capsule at the time of the collision.

A person has died following a single-vehicle crash in Moerewa that involved a school bus.The bus, which did not have any children in at the time, crashed on Pokapu Rd, between Kaka Rd and Davis Rd, around 4:20pm today.The driver…

A Ballarat police officer says her "world instantly broke" when she stopped to help at a fatal hit-run collision scene last week and discovered the victim was her father.

Sophie Thomson was driving on her usual route to work at Ballarat Police Station at around 7am on Thursday when she stopped to offer help to her colleagues at a crime scene on La Trobe Street in Delacombe.

Senior Constable Thomson said "it was just like any other day" for her until colleagues quickly ushered her away from the scene and revealed the cyclist who had been killed was her dad, David Thomson.

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"My world instantly broke," she said.

"I had unknowingly attended my dad's own crime scene."

Mr Thomson, 60, was riding his bike to work at Eureka Concrete along La Trobe Street about 5.41am on October 21 when he was struck head-on by a car as he approached an intersection.

Detective Senior Constable Sandro Lombardi, who is investigating the crime, said the driver did not pause after the collision, immediately fleeing the scene.

"There was no braking," he said,

"The driver cannot say he was unaware that it happened."

Senior Constable Lombardi said police had footage of the crash and there were a number of witnesses at the scene.

"The natural response is to stop and render assistance, but unfortunately on this occasion, the driver has fled," he said.

"It's really a tragic set of circumstances."

Police have today released footage of the "silver-coloured, sporty-like vehicle" involved in the crash, showing the damage it sustained to its windscreen and bonnet during the collision.

Senior Constable Lombardi has called for anyone who knows anything about the car or the incident to contact Crime Stoppers immediately.

"Please don't have allegiance to the driver. Do the right thing for the family."

Senior Constable Thomson has also called for people to share information and for the driver to turn himself in.

"My police family won't stop looking for you," she said.

"We just need some answers please."

Senior Constable Thomson said her father, a grandfather of two and a Ballarat cricketer for decades, had recently begun riding his bike to improve his fitness.

"David was my father, my hero and my absolute rock."

Anyone who witnessed the collision or has information about it or the car should contact Crime Stoppers on 1800 333 000 or submit a report online at www.crimestoppersvic.com.au.

The mum of missing Western Australia girl Cleo is holding out hope her little daughter will be found alive.

With abduction now a primary focus for police, the massive search for Cleo, four, has widened from the tiny coastal campsite in Carnarvon to a much broader zone of remote WA.

"We have hope that our girl is (out) there, somewhere," Ellie Smith said.

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"She was taken," Ms Smith said, sitting next to her partner Jake Gliddon, when asked what she believed had happened to Cleo.

"How did someone come into that tent and take Cleo? How could someone take a child?" she asked, with tears in her eyes.

"My gut just felt sick."

So far there have been few clues, at least made public, surrounding the mysterious disappearance of Cleo.

Cleo was staying inside a tent at the Blowholes Campsite with her mum, Mr Gliddon and baby sister Isla.

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A tent door zip was reported to be at least partly open, beyond the reach of little Cleo, and her sleeping bag was also missing from inside the family tent.

The question police are desperately trying to answer, with crucial time fast ticking away, is who took Cleo?

Police have called for CCTV footage from businesses and homes from a massive 1000-kilometre radius out from Blowholes Campsite, as they try to track a potential abductor who could have whisked Cleo away in a vehicle.

They are currently to locate a car witnesses said drove away from the campsite in the early morning hours when Cleo was reported missing, on October 16.

Ms Smith said she last saw Ellie in the tent at 1.30am when the girl woke for a drink, but she was gone at 6am.

She has not been seen since.

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The Blowholes camp ground is very isolated, situated just behind a beach and surrounded by sand dunes and a lighthouse.

Land and air searches of the coastline turned up nothing, and the search around Blowholes has been suspended.

Police have asked farmers and locals to check sheds and any unused shelters on their properties for clues.

"She could be anywhere," 9News reporter Mia Egerton told Today.

"It is very difficult terrain to search," adding that "a four-year-old just can't vanish into thin air."

Egerton said the Smith family is well-known in the Carnarvon community.

"You can't walk through town without seeing Cleo's face on every single shopfront," she said.

"There are bumper stickers on the back of every single car with her little face on them."

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Locals have gathered for candlelight vigils and undertaken a number of independent searches, including experienced stock musterers.

One local chopper company flew multiple sorties up and down the coast and inland, looking in vain for Cleo.

The Carnarvon community has raised $74,000 to support the family.

An abduction remains the "main line of inquiry" for police, but Egerton said detectives are ruling nothing out.

Police still have no suspects.

Meanwhile, the Blowholes campsite is open for business, with a small number of travellers staying at the WA tourist spot.

Egerton said there was now an "eerie" feel to the place.

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Prime Minister Scott Morrison today announced his Coalition government has agreed to aim for net zero emissions by 2050.

But what does net zero mean, and how do you get there?

As the world edges closer to COP26, a crucial United Nations climate summit hosted in Glasgow, Scotland, we answer the big questions about net zero 2050.

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What are net zero emissions?

Net zero emissions means removing as much greenhouse gas from the atmosphere as what's emitted, so the net amount added is zero.

And 2050 is a target date?

That's right.

But it's important to note that Australia is only committing to the 2050 net zero goal, it is not a legally binding target.

Some Western countries have made their net zero targets a legally binding goal, and critics of Mr Morrison argue Australia needs to follow suit.

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How do you achieve net zero?

Australia, its companies and farmers will need to rely on natural methods or use technology to "capture" the gas and store it away where it won't escape into the atmosphere.

What kind of natural methods?

Things like planting trees or restoring grasslands to soak up carbon dioxide (CO2), the most abundant greenhouse gas we emit.

And tech?

This is broadly about investment into green technologies, including solar and clean energy sources.

New technology is also being developed to literally suck carbon from the air near facilities which burn gas, coal and oil.

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What about carbon sinks?

Yes, Mr Morrison alluded to this when he spoke about 90 million hectares of productive agricultural land in Australia which can be used as a carbon sink.

By carbon sinks, scientists are describing a reservoir which absorbs CO2 from the atmosphere and locks it away.

And there are artificial carbon sinks too?

There sure are.

You might have heard the term carbon capture and storage.

Carbon sucked from the air can be stored, usually buried in reservoirs underground or below the floor of the sea, in artificial carbon sinks.

Some scientists are unsure about the potential consequence of using this practice on a large scale.

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