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American Focus > Blog > Environment > Climate threatens ‘cascade of tipping points’
Environment

Climate threatens ‘cascade of tipping points’

Last updated: July 17, 2025 12:30 am
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Climate threatens ‘cascade of tipping points’
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The Urgent Call to Action to Avert Catastrophic Climate Tipping Points

The urgency of the climate crisis has never been more apparent, with global warming projected to exceed 1.5°C within a few years. This places humanity in a dangerous zone where multiple climate tipping points pose catastrophic risks to billions of people. The good news is that we know what needs to be done to avert this crisis – restoring nature and transitioning energy and food systems. However, the time to act is now, as later is already too late.

In a recent statement, experts warn that irreversible changes have already been activated by current warming, putting ecosystems like tropical coral reefs at risk of unprecedented dieback. This not only threatens the livelihoods of millions who depend on these ecosystems but also increases the likelihood of triggering further damaging tipping points.

One of the most alarming scenarios is the potential collapse of the Atlantic Meridional Overturning Circulation (AMOC), which could have severe consequences for northwest Europe and global food and water security. The urgency of preventing these cascading climate dynamics requires immediate and unprecedented action from policymakers worldwide, especially at COP30.

The Role of Technologies in Mitigating Climate Tipping Points

To prevent climate tipping points, it is crucial to minimize temperature overshoot above 1.5°C. This requires halving global greenhouse gas emissions by 2030 compared to 2010 levels and accelerating decarbonization efforts. Only by reaching net zero emissions in time can we peak global temperatures well below 2°C and eventually return to, and below, 1.5°C.

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Current Nationally Determined Contributions (NDCs) fall short of limiting global warming to around 2.1°C. Therefore, nations must update their NDCs by September 2025 with targets consistent with minimizing overshoot of 1.5°C.

Policy mandates that trigger positive tipping points in economies and societies towards zero emissions are essential. This includes phasing out fossil fuels and transitioning to clean technologies like green hydrogen and plant-based proteins. Governments must adopt ambitious policies to drive these transitions and enforce them effectively.

Shifting Trajectories Towards Positive Tipping Points

To eliminate greenhouse gas emissions linked to the energy system, bans on petrol/diesel cars, diesel trucks, and gas boilers are essential. Additionally, investments in research and development of green technologies like hydrogen and steel are crucial.

In the food, farming, and deforestation sectors, policies that promote sustainable commodity production and shift towards plant-based proteins can help eliminate emissions. This not only reduces the risk of biosphere tipping points but also frees up land for nature regeneration.

Efforts to scale up sustainable removal of CO2 from the atmosphere through nature regeneration are also vital. Protecting indigenous rights, supporting community-led conservation initiatives, and valuing nature transparently are key steps towards achieving global biodiversity targets and limiting overshoot of 1.5°C.

Only through decisive policy and civil society action can we shift the trajectory from facing unmanageable climate tipping point risks to seizing positive tipping point opportunities.

About the Author

Brendan Montague is the editor of The Ecologist. This article is based on a press release from Exeter University.

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