Climate activists blocked traffic near Leicester Square on Monday (August 23) by chaining themselves to a car and a giant pink table erected in the middle of the street.
Police officers from London's Metropolitan Police cut the activists' chains and made arrests.
The activists from the Extinction Rebellion group (XR) want an emergency response from governments and a mass move away from polluting industries to avert the worst scenarios of devastation outlined by scientists.
The group, which had earlier rallied at London's Trafalgar Square, targeted the medieval Guildhall over the weekend, the home of the City of London Corporation, which governs the city's historic financial center.
London's police warned on Friday (August 21) that protests by environmental activists planned for the next two weeks will cause disruption across the capital and will distract officers from dealing with crime.