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).
While tipping points are often abrupt, rapid and irreversible, and may come as a surprise after only modest and smooth changes beforehand, they are not always unpredictable. Given their potential for disruption, there have been numerous attempts to identify when a system may be losing resilience and approaching a tipping point. These approaches, often called EWS, rely on monitoring the changes in the underlying behaviour of these systems across time and/or space prior to a transition. While these indicators are well grounded in theory, there are limitations to consider when transferring them to real-world systems.
Here, we introduce the theory of critical slowing down (CSD) – the phenomenon that allows most of the EWS detailed here to be used. We then go into detail about the various methods used to predict the movement towards tipping points. These concepts are illustrated with real-world case studies from targeted climate and ecological systems. Finally, we explore some limitations of these methods, some potential solutions, and look ahead to potential future research in this field.