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tipping points
'1.5ºC Is Dead': Climate Movement Holds Funeral for Paris Agreement Target
Almost a decade ago, parties to the Paris treaty agreed to work toward limiting temperature rise this century to 1.5ºC—but 2024 was the hottest year in human history, and countries around the world show no signs of reining in planet-wrecking fossil fuels anywhere near the degree that scientists warn is necessary to prevent catastrophic climate breakdown.
"Crossing 1.5ºC for a whole calendar year is a wake-up call for the world," said Olympic gold medalist and XR U.K. spokesperson Etienne Stott, highlighting another alarming record from last year. "If we want to avoid crossing further tipping points we need a complete transformation of society."
Extinction Rebellion and other climate groups held a funeral for the Paris agreement's 1.5°C temperature target in Cambridge, England on May 10, 2025. (Photo: Derek Langley)
Scientists from universities in the United Kingdom and Germany warned in a peer-reviewed paper published in the journal Earth System Dynamics last month that humankind is at risk of triggering various climate tipping points absent urgent action to dramatically reduce emissions from fossil fuels.
"There are levers policymakers can pull to rapidly phase out fossil fuels, but this requires standing up to powerful interests," Stott said Saturday. "Activists need to build power, resilience, and the world we want to see in our communities; but we also need to keep seeking the spark that will cause the worldwide transformation we need to see."
In addition to the Cambridge and U.K. arms of Extinction Rebellion, Saturday's action was organized by Cambridge Greenpeace, Cambridge Stop the War, and the Organization of Radical Cambridge Activists (ORCA).
Varsity, the independent student newspaper at the University of Cambridge, reported that the marchers "rallied at Christ's Pieces, where they heard from one of the organizers, who emphasised the harm caused by exceeding 1.5ºC of warming."
"The march then proceeded up Christ's Lane and down Sidney Street, led by a group of 'Red Rebels,' dressed in red robes with faces painted white, followed by 'pall bearers' carrying coffins painted black, with the words 'Inaction Is Death' in white," according to Varsity. "The procession was completed by a samba band who drummed as they walked, followed by protesters carrying a large sign reading 'Don't silence the science,' along with many other smaller placards."
Members of the "Red Rebel Brigade" led a procession around Cambridge, England as part of a funeral for the Paris agreement's 1.5°C temperature target on May 10, 2025. (Photo: Derek Langley)
Photos from organizers show participants displaying banners with messages such as "No Future on a Dead Planet," and additional messages painted on the black coffins: "1.5ºC Is Dead," "Act Now," "Ecocide," "RIP Earth," and "Web of Life."
"Politicians have broken their promises to keep global temperature rises to a livable 1.5ºC," declared Zoe Flint, a spokesperson for XR Cambridge. "For decades, people around the world have been resisting environmental devastation in their own communities and beyond—often facing state repression and violence as a result."
"With dozens of political protesters now in prison in this country, that repression has come to the U.K. too," Flint noted. "But when those least responsible for climate breakdown suffer the worst effects, we can't afford to give up the fight."
Parties to the Paris agreement are set to gather next in November at the United Nations climate summit, COP30, in Belém, Brazil.
'We Need Urgent Global Action': Study Warns Humanity on Path to Trigger 16 Climate Tipping Points
Climate scholars use the term "tipping point" to describe a critical threshold which, when crossed, "leads to significant and long-term changes of the system," the paper notes. Debate over it "has intensified over the past two decades," prompting several studies of specific risks.
"Climate tipping points could have devastating consequences for humanity," said co-author Tim Lenton in a statement. "It is clear that we are currently on a dangerous trajectory—with tipping points likely to be triggered unless we change course rapidly."
"We need urgent global action—including the triggering of 'positive tipping points' in our societies and economies—to reach a safe and sustainable future," added the Exeter professor and Global Systems Institute director.
Lenton's team calculated the probabilities of triggering 16 tipping points. They looked at the risks of serious damage to key glaciers, ice sheets, sea ice, and permafrost; the dieback of forests such as the Amazon; the die-off of low-latitute coral reefs; and the collapse of the Atlantic Meridional Overturning Circulation (AMOC), which is part of a crucial "global conveyor belt" of ocean currents.
To assess the risk of current policies triggering climate tipping points, the researchers focused on a scenario in which median warming of 2.8°C takes place by the end of the century.
On that pathway, the study says, "our most conservative estimate of triggering probabilities averaged over all tipping points is 62%... and nine tipping points have a more than 50% probability of getting triggered."
Under scenarios with lower temperature rise, "the risk of triggering climate tipping points is reduced significantly," the study continues. "However, it also remains less constrained since the behaviour of climate tipping points in the case of a temperature overshoot is still highly uncertain."
The paper concludes that "rapid action is needed to reduce greenhouse gas emissions, since climate tipping points are already close, and it will be decided within the coming decades if they will be crossed or not."
Lead author Jakob Deutloff shared that takeaway a bit more optimistically, saying that "the good news from our study is that the power to prevent climate tipping points is still in our hands."
"By moving towards a more sustainable future with lower emissions, the risk of triggering these tipping points is significantly reduced," he added. "And it appears that breaching tipping points within the Amazon and the permafrost region should not necessarily trigger others."
The paper was published during Covering Climate Now's joint week of media coverage drawing attention to the 89% of people worldwide who want their governments to do more to address the global crisis; ahead of a Global Systems Institute conference on tipping points this summer; and just over six months away from the next United Nations climate summit, COP30, in Brazil.
While some governments are trying to prevent the worst-case scenario by taking action to cut emissions, U.S. President Donald Trump has made clear since returning to office in January that he aims to deliver on his pro-fossil fuel campaign pledge to "drill, baby, drill."
On the heels of the
hottest year in human history, Trump is working to gut key agencies, ditched the Paris climate agreement, and has taken executive action to boost planet-wrecking coal, gas, and oil, including declaring a national energy emergency.
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