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Extinction Rebellion members said their campaign received a great deal of public attention but failed to get the government to budge.
Environmentalists glued themselves to the London Stock Exchange entrance and staged impromptu concerts in the middle of traffic on the final day of a campaign that brought parts of the British capital to a standstill.
Eight protesters glued themselves together with their arms around the handrail to the Treasury building near parliament in central London.
Activists from Extinction Rebellion — a fast-growing movement founded last year by British academics — have used 11 days of rallies to focus global attention on climate change.
Their ultimate goal is to slash greenhouse gas emissions to a net level of zero by 2025 and bring biodiversity loss to a halt.
But their immediate aim was to get British politicians to look past hot-button issues such as Brexit and think of ways to save the planet from irreparable damage that younger generations think will hurt them the most.
"The traffic disruptions have really, really brought the whole climate and environment out from being a niche issue," guitarist Nick Onley said while leading a group of 20 through a Beatles song performance in the middle of a busy London intersection.
"But it hasn't been a complete success. We haven't got to that point where the government says yes, please talk to us," Onley said as drivers stuck in the heart of London's bustling financial district furiously honked their horns.
The protest outside the London Stock Exchange building in the shadow of St. Paul's Cathedral saw several people gluing themselves to the pavement in front of one of the glass entrance turnstiles.
One person wearing a gas mask also chained himself to one of the sleek building's stone columns.
"Many of the most environmentally destructive companies in the world have their stock market listings at the London Stock Exchange (LSE)," the group said in a statement. "This institution literally trades in the devastation of our planet."
AFP reporters counted seven campaigners at the building's entrance. Police eventually separated them and trading opened as usual.