Thousands of climate change campaigners have attended a rally in London, calling for world leaders to act urgently on the issue.
The action included a march from the US embassy to Trafalgar Square, where celebrities joined a demonstration.
Some 22,500 people attended the rally, said the police while organisers said 25,000. There were no arrests.
Ashok Sinha, director of Stop Climate Chaos, said climate change was "the biggest threat the planet faces".
Speakers at Trafalgar Square urged the government to push for a global treaty to cap global warming at 2C or less, as well as helping developing countries to adapt to climate change.
As the Stern Review was published last week, Chancellor Gordon Brown promised the UK would lead the international response to tackle climate change.
And Environment Secretary David Miliband said the Queen's Speech would feature a climate bill to establish an independent Carbon Committee to work with the government to reduce harmful emissions.
The events were kicked off by cyclists who went on a "protest bike ride" to hand a petition into Downing Street calling for a tightening of annual emission targets.
'Self defeating'
But one of the UK's top climate scientists warned in a BBC News website article that, although climate change was "a reality", the language being used by some campaigners was becoming exaggerated and could weaken the arguments for policy change.
Mike Hulme, of the Tyndall Centre for Climate Change Research, also said he was concerned over the phenomenon of "catastrophic" climate change.
The action included a march from the US embassy to Trafalgar Square, where celebrities joined a demonstration.
Some 22,500 people attended the rally, said the police while organisers said 25,000. There were no arrests.
Ashok Sinha, director of Stop Climate Chaos, said climate change was "the biggest threat the planet faces".
Speakers at Trafalgar Square urged the government to push for a global treaty to cap global warming at 2C or less, as well as helping developing countries to adapt to climate change.
As the Stern Review was published last week, Chancellor Gordon Brown promised the UK would lead the international response to tackle climate change.
And Environment Secretary David Miliband said the Queen's Speech would feature a climate bill to establish an independent Carbon Committee to work with the government to reduce harmful emissions.
The events were kicked off by cyclists who went on a "protest bike ride" to hand a petition into Downing Street calling for a tightening of annual emission targets.
'Self defeating'
But one of the UK's top climate scientists warned in a BBC News website article that, although climate change was "a reality", the language being used by some campaigners was becoming exaggerated and could weaken the arguments for policy change.
Mike Hulme, of the Tyndall Centre for Climate Change Research, also said he was concerned over the phenomenon of "catastrophic" climate change.
wtf are "Stop Climate Chaos" - they look far too organised and funded
It all seems a warm up to some nasty tax rises being dreamt up
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