More than 20 people have been arrested in London at the start of two weeks of protests by environmental campaigners.
Extinction Rebellion activists are protesting in cities around the world, including Berlin, Amsterdam and Sydney.
Organisers have planned to shut down key sites in central London, in addition to demonstrating outside government departments.
Extinction Rebellion says protests in the capital will be five times bigger than similar events in April.
The protests are calling for urgent action on global climate and wildlife emergencies.
Activists barricaded themselves to vehicles in Westminster early on Monday as the demonstrations got under way.
Police were seen cutting two protesters from a car that had blocked Victoria Embankment, while campaigners also locked themselves to