The New Reality- Earth Breaks First Climate Tipping Point

The New Reality- Earth Breaks First Climate Tipping Point

RITURAJ PHUKAN

The second Global Tipping Points Report has stated that warm-water coral reefs, which are important for both people and marine species, are experiencing significant decline and may be past a critical threshold. The report indicates that unless global warming trends change, the majority of existing reefs could disappear. It also highlights that other environmental tipping points may occur, including persistent melting of polar ice sheets, potential disruption of major ocean currents, and continued loss of the Amazon rainforest.

Released by the University of Exeter in collaboration with international partners, the report warns that this is the first of several Earth system tipping points that pose significant risks without prompt intervention. With global warming projected to exceed the 1.5°C threshold, it is imperative for countries to limit temperature overshoot in order to prevent the crossing of additional tipping points. The report, authored by 160 scientists from 87 institutions across 23 countries, emphasizes that every increment in temperature and each year spent above 1.5°C is consequential.

The report states that abrupt and irreversible Earth system tipping points represent a distinct category of risk compared to other environmental challenges, and current policies and decision-making frameworks are insufficient to address them. It emphasizes the necessity for global initiatives focused on accelerating emissions reductions and expanding carbon removal efforts to limit temperature overshoot. Furthermore, the anticipated effects of tipping processes should be systematically integrated into risk assessments, adaptation strategies, loss and damage mechanisms, and human rights litigation.

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Warm-water coral reefs worldwide are undergoing significant mortality due to recurrent mass bleaching events. With current global temperatures approximately 1.4°C above pre-industrial levels, these reefs are exceeding their thermal threshold. Even if global warming is limited to 1.5°C, there is greater than a 99% probability that warm-water coral reefs will surpass this tipping point.

Coral reefs are unlikely to persist on a significant scale unless global temperatures return to approximately 1°C above pre-industrial levels or lower. While targeted conservation efforts that address additional human-induced stressors such as overfishing and pollution may help preserve isolated reef fragments, comprehensive regional risk assessments and robust governance frameworks are urgently required to address the anticipated decline in ecosystem services provided by reefs.

Further, the report indicates that the temperature increase required to prompt extensive dieback of the Amazon rainforest from climate change and deforestation is now estimated to be lower than previously reported, with the lower bound at 1.5°C. This finding emphasizes the relevance of further investigation and policy development. The Amazon supports over a hundred million people and may experience social tipping points, such as the establishment of inclusive local governance involving Indigenous Peoples, the recognition of traditional knowledge, and investment in conservation and restoration efforts, which may strengthen the resilience of ecosystems and communities.

Another case highlighted is the Atlantic Meridional Overturning Circulation (AMOC), which faces a significant risk of collapse, leading to more severe winters in north-west Europe, disruptions to the West African and Indian Monsoons, and reduced agricultural productivity across various regions. Such developments could have substantial implications for global food security.

The authors of the report are collaborating with Brazil’s COP30 Presidency to develop the “Action Agenda,” which serves as a platform for advancing climate transition strategies and fostering self-sustaining change across various sectorsincluding agriculture, energy, forestry, and urban development, toward a low-carbon and climate-resilient global transformation.

According to the report, initiating “positive tipping points” that encourage self-sustained change, such as the adoption of green technologies, is described as a potential pathway toward a safer, more equitable, and sustainable future. The researchers are collaborating with Brazil’s COP30 Presidency to include discussions about tipping points at the upcoming summit. The report also notes ongoing developments related to positive tipping points and identifies areas where further beneficial changes may occur.

Significant positive tipping points have been reached globally in the deployment of solar photovoltaic and wind energy technologies, as well as in the uptake of electric vehicles, battery storage solutions, and heat pumps within key markets. There remains potential to further accelerate these transitions. Strategic and coordinated policy interventions at so-called “super-leverage points” may trigger beneficial tipping cascades across interconnected sectors such as electricity, transportation, and heating, thereby expediting sector-wide transformation.

Once legacy polluting technologies are replaced, it is unlikely they will resurge, given that newer alternatives offer superior cost-effectiveness and performance. Additionally, societal perspectives are shifting, with global concern regarding climate change on the rise; notably, even relatively small groups can influence broader public opinion and catalyse widespread attitudinal change.

Several positive tipping points are emerging in sectors such as goods transport. Brazil, the host nation of COP30, possesses significant capacity to produce green steel, green hydrogen, and green ammonia, contributing to the advancement of these key technologies globally. Additionally, the COP30 Presidency has initiated a Global Mutirão (“collective efforts”) to promote climate action on an international scale.

Positive tipping points have the potential to swiftly enhance environmental health and biodiversity. The restoration of ecosystems can facilitate the recovery of degraded environments, while transitioning towards more sustainable consumption and production practices may induce significant changes in food and fibre supply chains that halt deforestation and ecosystem conversion.

It is essential to identify and activate additional positive tipping points. Improved indicators are required to assess tipping potential accurately. Once these tipping points are recognized, fostering positive change involves ensuring that the preferred innovation becomes the most cost-effective, accessible, or appealing choice. Collaboration among governments, businesses, civil society, and individuals is crucial. There is widespread understanding of the necessity for transformation and support for transitioning towards a cleaner, healthier world, provided the process is equitable. Achieving success may rely on pursuing strategies that minimise polarization.

Rituraj Phukan: Founder, Indigenous People’s Climate Justice Forum; Co-Founder, Smily Academy ;National Coordinator for Biodiversity, The Climate Reality Project India; Member, IUCN Wilderness Specialist Group; Commission Member – IUCN WCPA Climate Change, IUCN WCPA Connectivity Conservation, IUCN WCPA Indigenous People and Protected Areas Specialist Groups, IUCN WCPA South Asia Region and IUCN WCPA-SSC Invasive Alien Species Task Force; Member, International Antarctic Expedition 2013; Climate Force Arctic 2019 ; Ambassador, Marine Arctic Peace Sanctuary. Rituraj Phukan is the Climate Editor, Mahabahu and Convenor, Mahabahu Climate Forum.

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