HUNDREDS of activists plan to bring central London to a standstill tomorrow for the second time in a week to press their demand for serious government action on climate change.

Campaign group Extinction Rebellion said it will create non-violent “swarming roadblocks” until Friday.

Last Saturday, an estimated 6,000 activists blocked five major bridges in London during the group’s previous day of action.

The group’s ongoing campaign of civil disobedience is part of escalating international efforts aimed at forcing politicians to address the “ecological and climate emergency.”

Governments across the globe have 12 years at most to prevent climate catastrophe, the group said, citing a recent report by the Intergovernmental Panel on Climate Change.

The report by the United Nations scientific body warned that “unprecedented” action is needed to stop world temperature rising by 1.5˚C, rather than the feared 2˚C.

Extinction Rebellion’s Robin Boardman said the group wanted to “sincerely apologise” for any disruption caused to the public.

“Londoners, we have a problem — the government is not protecting the lives of future generations of Brits to come, due to its criminal inaction in the face of climate breakdown,” he said. “This emergency deserves an emergency response.

“Therefore, we tell the government to be prepared for swarms of concerned citizens, who are willing to be arrested, converging throughout the day in central London. Only through daily economic disruption and stopping business as usual will the government be made to listen.”

Extinction Rebellion has informed the Metropolitan Police and pledged that emergency vehicles will be allowed to pass.

The “swarming” by activists will take place from 7am in Parliament Square to draw attention to the decline in the population of bees due to “humankind’s failure” to protect the world’s ecosystem.

Dr Laila Kassam of Extinction Rebellion said: “Without insects and with increasingly extreme weather events, such as this summer’s drought, chaos is fast becoming the norm.

“We’re now looking down the barrel of food scarcity and major problems for humans and all species.”

She added that the group would only stop the campaign of protest actions when the government agrees to “come clean” with the public about the scale of the crisis and completely decarbonise the economy.