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“We therefore support those who are rising up peacefully against governments around the world that are failing to act proportionately to the scale of the crisis,” she said.

The declaration was coordinated by a group of scientists who support Extinction Rebellion, a civil disobedience campaign that formed in Britain a year ago and has since sparked offshoots in dozens of countries.

The group launched a fresh wave of international actions on Monday, aiming to get governments to address an ecological crisis caused by climate change and accelerating extinctions of plant and animal species.

A total of 1,307 volunteers had since been arrested at various protests in London by 2030 GMT on Saturday, Extinction Rebellion said. A further 1,463 volunteers have been arrested in the past week in another 20 cities, including Brussels, Amsterdam, New York, Sydney and Toronto, according to the group’s tally. More protests in this latest wave are due in the coming days.

While many scientists have shunned overt political debate, fearing that being perceived as activists might undermine their claims to objectivity, the 395 academics who had signed the declaration by 1100 GMT on Sunday chose to defy convention.

“The urgency of the crisis is now so great that many scientists feel, as humans, that we now have a moral duty to take radical action,” Grossman told Reuters.

Other signatories included several scientists who contributed to the U.N.-backed Intergovernmental Panel on Climate Change (IPCC), which has produced a series of reports underscoring the urgency of dramatic cuts in carbon emissions.