Harmful tipping points in the natural world pose some of the gravest threats faced by humanity. Their triggering will severely damage our planet’s life-support systems and threaten the stability of our societies.
In the Summary Report:
• Narrative summary
• Global tipping points infographic
• Key messages
• Key Recommendations
Executive summary
• Section 1
• Section 2
• Section 3
• Section 4
This report is for all those concerned with tackling escalating Earth system change and mobilising transformative social change to alter that trajectory, achieve sustainability and promote social justice.
In this section:
• Foreword
• Introduction
• Key Concepts
• Approach
• References
Considers Earth system tipping points. These are reviewed and assessed across the three major domains of the cryosphere, biosphere and circulation of the oceans and atmosphere. We then consider the interactions and potential cascades of Earth system tipping points, followed by an assessment of early warning signals for Earth system tipping points.
Considers tipping point impacts. First we look at the human impacts of Earth system tipping points, then the potential couplings to negative tipping points in human systems. Next we assess the potential for cascading and compounding systemic risk, before considering the potential for early warning of impact tipping points.
Considers how to govern Earth system tipping points and their associated risks. We look at governance of mitigation, prevention and stabilisation then we focus on governance of impacts, including adaptation, vulnerability and loss and damage. Finally, we assess the need for knowledge generation at the science-policy interface.
Focuses on positive tipping points in technology, the economy and society. It provides a framework for understanding and acting on positive tipping points. We highlight illustrative case studies across energy, food and transport and mobility systems, with a focus on demand-side solutions (which have previously received limited attention).
The scale of threat posed by Earth system tipping points underlines the critical importance of the 1.5 ̊C temperature goal and means that global mitigation should now assume an emergency footing. Fossil fuel emissions should be phased out worldwide before 2050. A rapid end to land use change emissions and shift to worldwide ecological restoration are also needed. Countries should reassess their highest possible ambitions accordingly, particularly wealthy, high-emitting nations.
Some Earth system tipping points are now likely to be triggered, causing severe and spatially uneven impacts on societies and interconnected ecological, social and economic systems. Tipping point impacts will be felt worst by the most vulnerable communities within and between nations, with knock-on impacts for global inequality, the stability of the world economy, and geopolitics. This provides an urgent impetus to strengthen adaptation and loss-and -damage governance in the UNFCCC, adjusting existing frameworks and increasing resources to account for tipping point threats.
Considerations of Earth system tipping point risks, corresponding action, and positive tipping point opportunities should be included in the Global Stocktake (GST), future revisions of Nationally Determined Contributions (NDCs), and in associated national and sub-national policy measures. Future GSTs should assess collective progress towards preventing Earth system tipping points, addressing potential impacts and fostering positive tipping points. All future NDCs should include national-scale systemic assessments of exposure to tipping point risks, measures that contribute to the prevention of tipping points, plans for managing potential impacts and strategies for fostering positive tipping points
Coordinated action by coalitions of state and non-state actors across governance, business and civil society can bring forward positive tipping points in politics, economies, technology, culture, and behaviour. A focus on ‘super-leverage points’ – for example policy mandates in high-emitting sectors such as power, road transport, green hydrogen/ ammonia and food – could create a cascade of positive changes.
The UN Secretary General should convene a global summit on the governance agenda for managing Earth system tipping point risks and maximising coordination on triggering positive tipping point opportunities to speed up mitigation and resilience. It should provide a forum for government, industry and civil society. As a matter of urgency, tipping point threats should also feature on the agenda of key international fora, including the 2024 meeting of the G20 in Brazil.
The above efforts should be supported by investment in improved scientific knowledge and monitoring
of negative and positive tipping points, and a much improved science-policy engagement process to more effectively and rapidly convert knowledge into action. To help stimulate this process, we support calls for an IPCC Special Report on Tipping Points in the current assessment cycle.