Climate activists attend a protest organised by the COP26 Coalition in Glasgow, Scotland. AP

Tens of thousands of protesters braved rain and wind in Glasgow on Saturday as part of worldwide demonstrations against what campaigners says is a failure of crunch UN climate talks to act fast enough to tame global warming.

Dozens of events are planned worldwide to demand cuts in fossil fuel use and immediate help for communities already affected by climate change, particularly in poorer countries.

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Meanwhile, more than 1,000 people demonstrated on Saturday in Australia's biggest cities of Sydney and Melbourne to protest against the government's climate policies and the strategies it offered at a UN climate summit in Glasgow.

Climate activists take part in a protest through the streets of London. AP

Sydney's first legal protest after a months-long COVID-19 lockdown saw about 1,000 people march in support of global action day for climate justice, a worldwide movement mobilised during the COP26 meeting.

"We're all out here to show that we want more from our government," said Georgia, one of the protesters.

In Glasgow, organisers and police said they ultimately expected up to 50,000 people to parade through the streets of the Scottish city.

Demonstrators began gathering on Saturday morning in a park near the COP26 summit venue, chanting: "Our world is under attack, stand up fight back!"

"I think a lot of politicians are scared of the power of this movement," said a 22-year-old Norwegian protester who gave her name as Jenny.

Parents and children from around the world call on leaders to end financing for fossil fuels in Glasgow. AP

Delegates from nearly 200 countries are in Glasgow to hammer out how to meet the Paris Agreement goals of limiting temperature rises to between 1.5 and 2 degrees Celsius.

At the halfway stage of the COP26 negotiations, some countries have upgraded their existing pledges to reduce greenhouse gas emissions, while there have been separate deals on phasing out coal, ending foreign fossil fuel funding, and slashing methane.

A week of government speeches and pledges at the two-week gathering in Glasgow brought promises to phase out coal, slash emissions of the potent greenhouse gas methane and cut deforestation.

Australia, however, has rejected the global methane pledge and campaigners and pressure groups have not been impressed by the commitments of other world leaders.

People participate in a rally during a global day of action on climate change in Sydney.

"The COP 26 agreements were happening and it's not turning out the best for Australia at the moment," added Georgia, the Sydney protester, who gave only one name.

Melbourne's protest was smaller than Sydney's, with just a few hundred people turning out for a rally that featured a giant koala bear emitting plumes of smoke, and protesters dressed as skeletons on bikes.

Several smaller events were held elsewhere in Australia.

Swedish teenage activist Greta Thunberg was among thousands of young campaigners who marched in Glasgow on Friday, demanding urgent action.