As climate change protests continued for a fourth day on Thursday, leaked WhatsApp messages suggested activists are planning to "shut down" Heathrow Airport on Good Friday.
The airport said it was "working with the authorities" to address any threat of disruption over the long Easter weekend.
It came after Metropolitan Police updated the arrest figure to 428 on Thursday.
Home secretary Sajid Javid offered his support to the police and condemned any "unlawful protests", while London mayor Sadiq Khan suggested cuts to police funding were restricting the Met's ability to cope with the demonstrations.
Three activists appeared in court where they pleaded not guilty to charges relating to their alleged involvement in obstructing trains at Canary Wharf station on Wednesday morning.
They were remanded in custody for a month until they next appear at Blackfriars Crown Court on 16 May.
Follow how the protests develop throughout the day
Along with other central bankers from around the world, he called on governments and financial institutions to take a pivotal role in keeping temperature rises “well below 2C” as pledged under the Paris climate agreement.
Mr Carney said the “enormous human and financial costs of climate change are having a devastating effect on our collective wellbeing”.
Three people have pleaded not guilty to charges relating to climbing on top of a train during climate change protests and have been remanded in custody until next month.
The two men and a woman appeared at Highbury Corner Magistrates’ Court on Thursday morning in relation to the incident during Extinction Rebellion (XR) protests at Canary Wharf station in London the previous day.
They have not been granted bail and will remain in custody until they are next due to appear at court on 16 May.
The Metropolitan Police have begun inquiries to identify two officers videoed dancing with climate change protesters in Oxford Circus on Wednesday night.
Commander Jane Connors said she was "disappointed by the video and the unacceptable behaviour of the officers in it".
She said: "We expect our officers to engage with protesters but clearly their actions fall short of the tone of the policing operation at a time when people are frustrated at the actions of the protesters.
"We will be reminding officers of their responsibilities and expectations in policing this operation - however the majority of officers have been working long hours and I am grateful to them for their continued commitment."
One activist could be seen being carried away by a group of officers in hi-vis jackets, while supporters applauded.
Cheers rang out and whistles blown as people were taken away into police vans.
He says: "It may sound frightening but the scientific evidence is that if we have not taken dramatic action within the next decade we could face irreversible damage of the natural world, and the collapse of our societies.

"We are running out of time but there is still hope. I believe that if we better understand the threat we face, the more likely it is that we can avoid such a catastrophic future.
"Our climate is changing because of one simple fact...our world is getting hotter."
Activists could spark travel chaos if they go ahead with plans to target the country’s busiest airport at the start of the long Easter weekend.
Screenshots shared on social media show a message addressed to “rebels” which says: “Tomorrow we raise the bar. We are going to shut down Heathrow.
“There is a deep remorse for those whose holiday and family plans will be disrupted tomorrow. It is not our intention to cause further separation.
“However, the aviation industry needs to be targeted and we are all aware of the deep, structural change that needs to come.”
The group is planning to meet at a petrol station close to the airport at 8am on Friday, according to the messages.
The message says protesters will use a “standard swarming process” and claims that “if there are lots of us, there will be a low risk of arrest”.
He also condemned "unlawful" protesters for causing "misery" to people's lives with disruption.
He said: “Everyone has the right to protest peacefully – it’s a cherished, long-standing British tradition and a fundamental cornerstone of the democracy we live in.

"Let me be clear - I totally condemn any protesters who are stepping outside the boundaries of the law.
"They have no right to cause misery for the millions of people who are trying to lead their daily lives. Unlawful behaviour will not be tolerated."
In a letter to home secretary Sajid Javid, he said: "I support the right to peaceful and lawful protest - which is a cornerstone of our democracy.
"But this right must be balanced against the need to ensure the safety and security of all Londoners, as well as the continued running of our city.
"The Met take a consistent approach to protests regardless of the cause that motivates the protesters.

"However, the Met's ability to police protests without impacting on core policing priorities - such as tackling knife crime - has been made significantly harder by the huge cuts to Government police funding."
He said he would be working with Scotland Yard to consider whether a claim for a special grant from the Home Office would be justified "to compensate for the costs of policing the current protests".
"Passengers should contact their airlines for up-to-date information on their journeys."
One of these was a boy of 15, she said, who quietly got to his feet and was led away by police as supporters cheered.
Other demonstrators could be seen avoiding police officers' attempts to communicate with them, by picking up their phones or starting conversations with their neighbours.

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