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).
Passing ESTPs can increase the magnitude of global, regional, and local changes. At the global scale, the magnitude of (eventual) sea level rise will be much increased by passing ESTPs for Greenland and Antarctic ice sheets, and the distribution of sea level height will adjust – increasing furthest away from the ice sheet that is lost (as the Earth’s gravity field adjusts). AMOC collapse would cause sea level rises of up to a metre in the North Atlantic region, while SPG shift would raise them by up to 30 centimetres along the northeast seaboard of North America. Passing ESTPs can also add significantly to global warming by releasing carbon – for example, from abrupt permafrost thaw or Amazon rainforest dieback – or lowering planetary albedo – from lost cloud cover associated with the Amazon forest, or lost snow/ice cover.
At the regional scale, passing ESTPs can increase the magnitude of climate changes. For example, Amazon dieback would amplify warming and drying in the region and the neighbouring agricultural region. At the local scale, passing ESTPs can increase the frequency and magnitude of extreme events. For example, boreal forest dieback can greatly increase the severity of wildfires. These also have regional impacts on air quality.