Dame Emma Thompson arrived in London to join the Extinction Rebellion protests, even though she had to 5,400-mile flight to be there.
The 60-year-old Hollywood star flew in from Los Angeles and has stated she is willing to be arrested as part of the protest in central London.
Her first action was to urge others to "come and join" the demonstrations, in a video shared by the campaign group, despite running up a three-tonne carbon footprint to be in the thick of the protest.
Dame Emma admitted that she "wanted to be arrested" as part of her 60th birthday celebrations, which coincided with the first day of protests, but was 'away with her husband' at the time.
Speaking about joining the protest, Dame Emma said: "I absolutely wanted to be arrested on my 60th birthday but I didn't quite manage that.
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"I'm so proud and thrilled to be part of Extinction Rebellion."
A representative of Dame Emma said she needed to take the 5,400-mile flight home to London after working in LA.
She joined the protests on the day organisers announced plans to target Heathrow Airport at the start of the Easter bank holiday weekend, which has been condemned by London mayor Sadiq Khan.
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Dame Emma said: "We will occupy until you take action because that's the only way we are going to save our planet.
"We have to be here, we have to do this. It's inconvenient for people sometimes but its much more inconvenient to leave a planet that's so completely destroyed."
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