RKR-C is considered severe when the functioning of critical infrastructure cannot be secured and maintained against climate change impacts, resulting in the frequent and widespread breakdown of service delivery and eventually a significant rise of detrimental impacts on people , the economy  or the environment  above historically observed levels. Severity in this RKR is assessed on two levels for  direct impacts of climate change on infrastructure assets and networks  on which most of the literature focuses, as well as  indirect and cascading downstream impacts to people, economy and environment , for which attribution is more difficult and uncertainties tend to be much higher. Overall, the literature with quantified assessments of climate change infrastructure risks remains to be less extensive than for many other risks, particularly with regard to assessments focusing on the Global South. While climate-related changes in hazards are widely considered in the literature, changes in future exposure and vulnerability conditions are often not treated explicitly. In addition, the severity of infrastructure risks also depends on future trends in the capacity to maintain, repair and rebuild infrastructure and adapt it to new hazard intensities . These are mostly not quantified in a forward-looking manner in the literature; however, damage projections  indicate a rapidly rising demand for investment, straining the financial capacity of countries .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report