Exploring disaster impacts on adaptation actions in 549 cities worldwide

Area of Science:

• Urban planning and disaster risk reduction.
• Climate change adaptation and resilience.
• Global environmental governance.

Background:

• Evidence on disaster impacts on urban adaptation is limited, often relying on small case studies.
• A global overview of disaster effects on city-level adaptation actions is lacking.
• Understanding the interplay between disaster characteristics and adaptation strategies is crucial.

Purpose of the Study:

• To globally assess the influence of disaster frequency and severity on urban adaptation actions.
• To explore how adaptive capacity and economic factors mediate disaster-adaptation relationships.
• To identify specific adaptation action types influenced by different disaster impacts.

Main Methods:

• Regression analysis of disaster data and adaptation actions in 549 cities worldwide.
• Categorization of adaptation actions into four distinct types.
• Examination of disaster frequency, severity, economic losses, human losses, and adaptive capacity.

Main Results:

• In cities with high adaptive capacity, economic losses correlate with increased adaptation actions for recent disaster types and general preparedness.
• Increased disaster frequency is linked to reduced adaptation actions for non-recent hazard types.
• Human losses show minimal impact on adaptation actions; a 'wealth effect' is observed, where affluent nations exhibit greater adaptation.

Conclusions:

• Disaster impacts, particularly economic losses, can stimulate urban adaptation, especially in high-capacity cities.
• Adaptive capacity and economic wealth significantly shape the incentives and opportunities for urban adaptation.
• While overall disaster frequency and severity have limited direct impact, specific disaster types and adaptive capacities are critical factors.