University of Bristol: Bristol scientist has key voice in new global report highlighting grave peril posed by human-induced climate change and urgent need to act

The report concluded the world faces unavoidable multiple climate hazards over the next two decades with global warming of 1.5°C (2.7°F). Even temporarily exceeding this warming level will result in additional severe impacts, some of which will be irreversible. Risks for society will increase, including to infrastructure and low-lying coastal settlements.

Professor Daniela Schmidt, from the University of Bristol’s world-renowned Cabot Institute for the Environment, was co-ordinating lead author for the assessment for Europe and co-lead for the work in the summary for policy makers on impacts and risks for natural, managed, and human systems.

Professor Schmidt said: “This report is an alarming warning about the repercussions of failing to act. It shows that climate change is a serious and growing danger to our wellbeing and a healthy planet. Our actions today will help guide people locally and regionally how they can adapt and how nature responds to increasing climate risks.”

The Summary for Policymakers of the IPCC Working Group II report, Climate Change 2022: Impacts, Adaptation and Vulnerability was approved yesterday by 195 member governments of the IPCC, through a virtual approval session held over the past fortnight.

Urgent action to tackle increasing risks

Increased heatwaves, droughts and floods are already exceeding plants’ and animals’ tolerance thresholds, driving mass mortalities in species such as trees and corals. These weather extremes are occurring simultaneously, causing devastation on many levels that is increasingly difficult to manage. They have exposed millions of people to acute food and water insecurity, especially in Africa, Asia, Central and South America, on Small Islands and in the Arctic.

To avoid mounting loss of life, biodiversity and infrastructure, ambitious, faster action is needed to adapt to climate change, while also making rapid, deep cuts in greenhouse gas emissions. The report points out that so far, progress on adaptation is uneven and there are increasing gaps between action taken and what is needed to deal with the increasing risks. According to its findings, these gaps are largest among lower-income populations.

The Working Group II report is the second instalment of the IPCC’s Sixth Assessment Report (AR6), which will be completed this year.

Safeguarding and strengthening nature is key to securing a liveable future

There are options to adapt to a changing climate. This report provides new insights into nature’s potential not only to reduce climate risks, but also to improve people’s lives.

“Healthy ecosystems are more resilient to climate change and provide life-critical services such as food and clean water,” said IPCC Working Group II Co-Chair Hans-Otto Pörtner.

“By restoring degraded ecosystems and effectively and equitably conserving 30 to 50% of Earth’s land, freshwater and ocean habitats, society can benefit from nature’s capacity to absorb and store carbon, and we can accelerate progress towards sustainable development, but adequate finance and political support are essential.”

Scientists point out that climate change interacts with global trends such as unsustainable use of natural resources, growing urbanisation, social inequalities, losses and damages from extreme events and a pandemic, jeopardising future development.

“Our assessment clearly shows that tackling all these different challenges involves everyone – governments, the private sector, civil society – working together to prioritise risk reduction, as well as equity and justice, in decision-making and investment,” said IPCC Working Group II Co-Chair Debra Roberts.

“In this way, different interests, values and world views can be reconciled. By bringing together scientific and technological know-how as well as Indigenous and local knowledge, solutions will be more effective. Failure to achieve climate resilient and sustainable development will result in a sub- optimal future for people and nature.”

Cities: hotspots of impacts and risks, but also vital part of solution

This report provides a detailed assessment of climate change impacts, risks and adaptation in cities, where more than half the world’s population lives. People’s health, lives and livelihoods, as well as property and critical infrastructure, including energy and transportation systems, are being increasingly adversely affected by hazards from heatwaves, storms, drought and flooding as well as slow-onset changes, including sea level rise.

“Together, growing urbanization and climate change create complex risks, especially for those cities that already experience poorly planned urban growth, high levels of poverty and unemployment, and a lack of basic services,” Debra Roberts said.

“But cities also provide opportunities for climate action – green buildings, reliable supplies of clean water and renewable energy, and sustainable transport systems that connect urban and rural areas can all lead to a more inclusive, fairer society.”

There is increasing evidence of adaptation that has caused unintended consequences, for example destroying nature, putting peoples’ lives at risk or increasing greenhouse gas emissions. This can be avoided by involving everyone in planning, attention to equity and justice, and drawing on indigenous and local knowledge.

A narrowing window for action

Climate change is a global challenge that requires local solutions and that’s why the Working Group II contribution to the IPCC’s Sixth Assessment Report (AR6) provides extensive regional information to enable Climate Resilient Development.

The report clearly states Climate Resilient Development is already challenging at current warming levels. It will become more limited if global warming exceeds 1.5°C (2.7°F). In some regions it will be impossible if global warming exceeds 2°C (3.6°F). This key finding underlines the urgency for climate action, focusing on equity and justice. Adequate funding, technology transfer, political commitment and partnership lead to more effective climate change adaptation and emissions reductions.

Professor Schmidt said: “The scientific evidence is clear and irrefutable: climate change is a threat to human wellbeing and the health of the planet. Any further delay in joint, focused global action will mean missing an opportunity to secure a liveable future.”