Extinction Rebellion: green protests snarl London traffic

A demonstrator holds a banner during a climate protest in Parliament Square in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world. (AP Photo/Kirsty Wigglesworth)
Skeletons are carried as demonstrators take part in a 'Funeral Procession' during a climate protest in Parliament Square in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world.(AP Photo/Kirsty Wigglesworth)
A climate change protester cycles round marble Arc offering free rides to children in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world. (AP Photo/Alastair Grant)
A demonstrator bangs a drum during a climate protest in Parliament Square in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world. (AP Photo/Kirsty Wigglesworth)
A skeleton is carried past the Winston Churchill statue as demonstrators take part in a 'Funeral Procession' during a climate protest in Parliament Square in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world.(AP Photo/Kirsty Wigglesworth)
Demonstrators hold a banner during a climate protest in Parliament Square in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world. (AP Photo/Kirsty Wigglesworth)
A demonstrator dressed in a bird costume attends a climate protest in Parliament Square in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world. (AP Photo/Kirsty Wigglesworth)
A demonstrator takes part in a 'Funeral Procession' during a climate protest in Parliament Square in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world.(AP Photo/Kirsty Wigglesworth)
Demonstrators listen to speakers during a climate protest in Parliament Square in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world. (AP Photo/Kirsty Wigglesworth)
A woman dressed as a wood nymph during a climate protest in Parliament Square in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world.(AP Photo/Kirsty Wigglesworth)
Demonstrators hold a banner during a climate protest in Parliament Square in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world. (AP Photo/Kirsty Wigglesworth)
A general view of Oxford Circus occupied by climate change protesters during a demonstration in London, Monday, April 15, 2019. Extinction Rebellion have organised a nationwide week of action, they are calling for a full-scale Rebellion to demand decisive action from governments on climate change and ecological collapse. They plan to engage in acts of non-violent civil disobedience against governments in capital cities around the world. (AP Photo/Alastair Grant)

LONDON — Environmental protesters blocked access to several major London landmarks and vandalized oil company Shell's headquarters Monday as they tried to bring the city to a standstill.

The group Extinction Rebellion was seeking to paralyze parts of central London to highlight demands for the British government to declare a climate emergency.

Thousands of protesters converged on Marble Arch, Oxford Circus, Waterloo Bridge, Piccadilly Circus and Parliament Square. Some activists glued themselves to windows at Shell headquarters near Waterloo, and others smashed glass revolving doors and sprayed the building with graffiti.

Many carried signs pleading with the government to make fighting climate change a top priority.

Police said three men were arrested in the ongoing protests. They have not been identified or charged.

Extinction Rebellion drew attention to its cause two weeks ago when members stripped to their underwear in the public gallery in Parliament during a Brexit debate.

Protester Olivia Evershed, 23, said climate policies must be altered quickly to prevent catastrophic changes.

"If we don't do anything to change this, our children will die," she said.

Police advised Londoners to leave extra time for their journeys because of possible delays caused by the protest. Protesters aim to keep the demonstrations going for two weeks.

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