Hundreds of activists have caused major disruption by blocking bridges across London.
The environmental protesters from campaign group Extinction Rebellion have staged sit-down protests on five central London bridges.
The group are calling for the government to change its environmental policy, claiming the UK could face "starvation" if "the weather effect continues as it is".
Today's protest follows a series of events that have taken place under the Extinction Rebellion banner.
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On Monday, 22 people were arrested after protesters blocked traffic and glued themselves to entry gates at the Department for Business, Energy and Industrial Strategy.
On Wednesday, more activists were detained following action near Downing Street and at the Department for Environment, Food and Rural Affairs in Westminster.
The organisers estimate that 50 people have been arrested for protest action this week.
Dr Gail Bradbrook, one of the organisers of the protests, said: "We've basically got three demands: one is that the Government have to tell the truth. People think that climate change is something happening to somebody else at some other time, but it's coming home."