Thousands of young activists have begun marching through the streets of Glasgow to demand action on climate change from leaders and politicians at Cop26.
Photographs show the streets lined with crowds of people holding placards demanding change for the future, with participants marching from Kelvingrove Park to George Square.
Campaigner Greta Thunberg, fellow activist Vanessa Nakate and other young campaigners, as well as local trade unionists, will speak to crowds at the end of the march through the city where the UN summit is being held.
The climate strike has been organised by Fridays for Future Scotland who said they were demanding climate justice and seeking to hold global leaders to account.
It comes as the Cop26 talks feature events highlighting the voice of young people and education in climate action.
At least 8,000 people are expected to take part in the march.
Ms Thunberg has been highly critical of the two-week conference, claiming it is the most "excluding Cop ever" and labelling it a "two-week celebration of business as usual and blah blah blah".
Charlie O'Rourke, 14, from Glasgow, skipped school to attend the march with his mother Cairsty O'Rourke and sister Edith.
He said global leaders at Cop26 must "listen to the people".
He told the PA news agency: "Listen to what they want to say. Don't just go for profit. Listen to what the planet needs."
His mother Cairsty said she was there for her children and for "the generations to come to just show that something has to happen and it has to happen very quickly".
Ms O'Rourke, who is from Glasgow and works for the NHS, said the Scottish Government has been "on the fence for too long" on the issue of the Cambo oilfield.
She added: "I'd like to hear Nicola Sturgeon saying a bit more against it. I'd like all of this funding to go into a way out of this, a way out of using fossil fuels."
Finlay Pringle, 14, from Ullapool in the Scottish Highlands, travelled by train to Glasgow with his father to take part in the march.
He said: "If you really, truly love something and you want to protect it, no matter what it is, it doesn't have to be climate striking, but if there's something that you love and you want to protect it, then you should do that, don't think twice about it."
People of all ages have joined the youth-focused protest.
Among them are a group of mothers from around the world, including Rosamund Adoo Kissi Debrah, whose daughter Ella died from an asthma attack as a result of severe air pollution.
The group will also be handing in a letter at Cop26 calling for an end to new fossil fuel financing for the sake of their children's health and future.
The world is at a "long-awaited political tipping point" in the fight against climate change, former US vice-president Al Gore has said, as he praised youth climate strikers in Glasgow.
Mr Gore, who served two terms as vice-president under Bill Clinton, added that "impressive" pledges for action have been made at the city's Cop26 summit in Glasgow.
But he warned the climate crisis is getting worse "faster than we are yet implementing solutions", as he said more political will is needed to tackle the problem.
Speaking at the summit, he said: "Young people all around the world are telling us now is the time.
"In every nation Fridays for Future...outside this meeting hall today.
"This is a massive demand by the young people of the world and don't tell them it's impossible. It is possible.
"We have the tools and we have the ability to this."
COP26 President Alok Sharma said: “Wherever I have been in the world, I have been struck by the passion and the commitment of young people to climate action.
The voices of young people must be heard and reflected in these negotiations here at COP. The actions and scrutiny of young people are key to us keeping 1.5 alive and creating a net-zero future.
“I am also aware of the fear and anxiety many of them feel about the future of the planet, including my own children.
"That is why we must act on the COY16 Global Youth Position Statement from COY16 and the manifesto from the Milan Youth4Climate Summit.”
YOUNGO Global Focal Points, Heeta Lakhani and Marie-Claire Graf said: “YOUNGO has been working closely with the U.K. Presidency and the UNFCCC Secretariat to co-design Youth and Public Empowerment Day.
"We successfully profiled global youth voices through the COY16 Global Youth Statement, and brought together four generations to share best practice examples of achieving climate justice collectively.”
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Friday's protest comes ahead of marches on Saturday where tens of thousands of people are again expected in Glasgow, with other marches in London and cities around the UK, as well as across the world.
Police have warned they will deal "swiftly and robustly" with any violent disorder or damage to property during planned Cop26 protests in Glasgow over the coming days.
Police Scotland Assistant Chief Constable Gary Ritchie said officers have engaged with key campaign groups to ensure the protests can take place safety, but they will quickly crack down on any problems if need be.
The protests come at the end of the first week of the conference, where countries are under pressure to increase ambition on cutting greenhouse gas emissions and to ensure finance for poor countries to tackle the crisis.
