The science of weather event attribution requires high-quality observational data and climate models that are currently available only in highly developed countries . In addition, further research is necessary to determine the impacts of climate change on water-related extremes in the urban areas of developing countries . For example, a combination of observational analysis and global coupled climate models showed that the 2015 flooding event in Chennai  could not be attributed to anthropogenic climate change, with the effects of that being relatively small in the region due to the impact of GHG increases being largely counteracted by those of aerosols  . Further research is also required to determine the impacts of climate change on water-related extremes in informal settlements where vulnerability to water insecurity is high due to poverty, overcrowding, poor-quality housing and lack of basic infrastructure .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report