Climate change impacts and risks are becoming increasingly complex and more difficult to manage. Multiple climate
hazards will occur simultaneously, and multiple climatic and non-climatic risks will interact, resulting in compounding
overall risk and risks cascading across sectors and regions. Some responses to climate change result in new impacts and
risks. (high confidence) {1.3, 2.4, Box 2.2, Box 9.5, 11.5, 13.5, 14.6, Box 15.1, CCP1.2, CCP2.2, CCB COVID, CCB DISASTER,
CCB INTEREG, CCB SRM, }
B.5.1 Concurrent and repeated climate hazards occur in all regions, increasing impacts and risks to health, ecosystems, infrastructure, livelihoods
and food (high confidence). Multiple risks interact, generating new sources of vulnerability to climate hazards, and compounding overall
risk (high confidence). Increasing concurrence of heat and drought events are causing crop production losses and tree mortality (high
confidence). Above 1.5°C global warming increasing concurrent climate extremes will increase risk of simultaneous crop losses of maize
in major food-producing regions, with this risk increasing further with higher global warming levels (medium confidence). Future sea
level rise combined with storm surge and heavy rainfall will increase compound flood risks (high confidence). Risks to health and food
production will be made more severe from the interaction of sudden food production losses from heat and drought, exacerbated by
heat-induced labour productivity losses (high confidence). These interacting impacts will increase food prices, reduce household incomes,
and lead to health risks of malnutrition and climate-related mortality with no or low levels of adaptation, especially in tropical regions
(high confidence). Risks to food safety from climate change will further compound the risks to health by increasing food contamination
of crops from mycotoxins and contamination of seafood from harmful algal blooms, mycotoxins, and chemical contaminants (high
confidence). {Figure TS.10c, 5.2, 5.4, 5.8, 5.9, 5.11, 5.12, 7.2, 7.3, 9.8, 9.11, 10.4, 11.3, 11.5, 12.3, 13.5, 14.5, 15.3, Box 15.1, 16.6, CCP1.2,
CCP6.2, , WGI AR6 SPM A.3.1, WGI AR6 SPM A.3.2, WGI AR6 SPM C.2.7}
B.5.2 Adverse impacts from climate hazards and resulting risks are cascading across sectors and regions (high confidence), propagating
impacts along coasts and urban centres (medium confidence) and in mountain regions (high confidence). These hazards and cascading
risks also trigger tipping points in sensitive ecosystems and in significantly and rapidly changing social-ecological systems impacted
by ice melt, permafrost thaw and changing hydrology in polar regions (high confidence). Wildfires, in many regions, have affected
ecosystems and species, people and their built assets, economic activity, and health (medium to high confidence). In cities and
settlements, climate impacts to key infrastructure are leading to losses and damages across water and food systems, and affect
economic activity, with impacts extending beyond the area directly impacted by the climate hazard (high confidence). In Amazonia,
and in some mountain regions, cascading impacts from climatic (e.g., heat) and non-climatic stressors (e.g., land use change) will result
in irreversible and severe losses of ecosystem services and biodiversity at 2°C global warming level and beyond (medium confidence).
Unavoidable sea level rise will bring cascading and compounding impacts resulting in losses of coastal ecosystems and ecosystem
services, groundwater salinisation, flooding and damages to coastal infrastructure that cascade into risks to livelihoods, settlements,
health, well-being, food and water security, and cultural values in the near to long-term (high confidence). (Figure SPM.3) {Figure TS.10,
2.5, 3.4, 3.5, Box 7.3, Box 8.7, Box 9.4, 11.5, Box 11.1, 12.3, 13.9, 14.6, 15.3, 16.5, 16.6, CCP1.2, CCP2.2, CCP5.2, CCP5.3, CCP6.2,
CCP6.3, Box CCP6.1, Box CCP6.2, CCB EXTREMES, WGI AR6 Figure SPM.8d}