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).
Sea ice hosts unique ecosystems and plays a central role in marine life, influencing marine organisms and food webs by impacting on the penetration of light into the ocean and supplies of nutrients and organic matter (Cooley et al., 2022). Ongoing reductions in Arctic sea ice due to rising temperatures can therefore be expected to have direct impacts on biodiversity in the Arctic ocean. Moreover, reductions in sea ice cover in the Arctic lead to increased temperatures in the region due to decreased surface albedo, especially in summer when ice extent is at its annual low and daylight hours are long. This ice-albedo feedback is a key reason for the regional warming in the Arctic being four times the global rate of warming over the last four decades (Rantanen et al., 2022), contributing to the impacts of rising temperatures on ecosystems in the region and also potentially influencing climate change impacts at global scales by increasing the net energy imbalance of the planet. Reductions in summer sea ice have economic implications by opening routes for shipping and increasing access for fossil fuel extraction and export (Challinor and Benton, 2021), as well as mineral extraction. Arctic warming also has the potential to impact the jet stream and hence affect regional climates beyond its borders, although the current and future impacts of this remain uncertain (Barnes and Screen, 2015).